A002162 -id:A002162 - cp's OEIS frontend

A074066 Zigzag modulo 3.

1, 4, 3, 2, 7, 6, 5, 10, 9, 8, 13, 12, 11, 16, 15, 14, 19, 18, 17, 22, 21, 20, 25, 24, 23, 28, 27, 26, 31, 30, 29, 34, 33, 32, 37, 36, 35, 40, 39, 38, 43, 42, 41, 46, 45, 44, 49, 48, 47, 52, 51, 50, 55, 54, 53, 58, 57, 56, 61, 60, 59, 64, 63, 62, 67, 66, 65, 70, 69

Offset: 1

Reinhard Zumkeller, Aug 17 2002

Take natural numbers, exchange trisections starting with 2 and 4.

Eric Weisstein's World of Mathematics, Alternating Permutations.
Reinhard Zumkeller, Illustration for A074066-A074068.
Index entries for linear recurrences with constant coefficients, signature (1,0,1,-1).
Index entries for sequences that are permutations of the natural numbers.

Cf. A002162, A064429, A074067, A074068.

a074066 n = a074066_list !! (n-1)
a074066_list = 1 : xs where xs = 4 : 3 : 2 : map (+ 3) xs
-- Reinhard Zumkeller, Feb 21 2011

a[n_] := n + Mod[n, 3]*(3*Mod[n, 3] - 5); a[1] = 1; Table[a[n], {n, 1, 69}] (* Jean-François Alcover, Nov 04 2011 *)
Join[{1},Flatten[Reverse/@Partition[Range[2,73],3]]] (* Harvey P. Dale, Feb 17 2012 *)

a(1)=1; for n>0: a(3*n-1) = 3*n+1, a(3*n) = 3*n, a(3*n+1) = 3*n-1.
a(a(n))=n (self-inverse permutation); for n>1: a(n) = n iff n == 0 modulo 3.
For n > 1: a(n) = 3*floor(n/3) + (n mod 3)^2 * (-1)^(n mod 3); a(1)=1.
a(n) = a(n-1) + a(n-3) - a(n-4) for n > 5. - Chai Wah Wu, May 25 2016
For n > 1, a(n) = n - (4/sqrt(3))*sin(2*n*Pi/3). - Wesley Ivan Hurt, Sep 29 2017
g.f.: x + x^2*(4-x-x^2+x^3) / ( (1+x+x^2)*(x-1)^2 ). - R. J. Mathar, May 22 2019
Sum_{n>=1} (-1)^(n+1)/a(n) = log(2) (A002162). - Amiram Eldar, Dec 24 2023

A092486 Take natural numbers, exchange first and third quadrisection.

Original entry on oeis.org

3, 2, 1, 4, 7, 6, 5, 8, 11, 10, 9, 12, 15, 14, 13, 16, 19, 18, 17, 20, 23, 22, 21, 24, 27, 26, 25, 28, 31, 30, 29, 32, 35, 34, 33, 36, 39, 38, 37, 40, 43, 42, 41, 44, 47, 46, 45, 48, 51, 50, 49, 52, 55, 54, 53, 56, 59, 58, 57, 60, 63, 62, 61, 64, 67, 66, 65, 68, 71, 70, 69, 72

Offset: 0

Ralf Stephan, Apr 04 2004

Harry J. Smith, Table of n, a(n) for n = 0..20003
Index entries for linear recurrences with constant coefficients, signature (2,-2,2,-1).
Index entries for sequences that are permutations of the natural numbers.

Cf. A002162, A080412, A064429, A074066, A080782, A159966.

Flatten[Partition[Range[80],4]/.{a_,b_,c_,d_}->{c,b,a,d}] (* Harvey P. Dale, Aug 12 2012 *)

{ f="b092486.txt"; for (n=0, 5000, a0=4*n + 3; a1=a0 - 1; a2=a1 - 1; a3=a0 + 1; write(f, 4*n, " ", a0); write(f, 4*n+1, " ", a1); write(f, 4*n+2, " ", a2); write(f, 4*n+3, " ", a3); ); } \\ Harry J. Smith, Jun 21 2009

G.f.: (3-4*x+3*x^2)/((1+x^2)*(1-x)^2).
a(4n) = 4n+3, a(4n+1) = 4n+2, a(4n+2) = 4n+1, a(4n+3) = 4n+4.
a(n) = n+1+i^n+(-i)^n, where i is the imaginary unit. - Bruno Berselli, Feb 08 2011
From Wesley Ivan Hurt, May 09 2021: (Start)
a(n) = 2*a(n-1)-2*a(n-2)+2*a(n-3)-a(n-4).
a(n) = 1 + n + 2*cos(n*Pi/2). (End)
Sum_{n>=0} (-1)^n/a(n) = log(2) (A002162). - Amiram Eldar, Nov 28 2023

A166711 Permutation of the integers: two positives, one negative.

Original entry on oeis.org

0, 1, 2, -1, 3, 4, -2, 5, 6, -3, 7, 8, -4, 9, 10, -5, 11, 12, -6, 13, 14, -7, 15, 16, -8, 17, 18, -9, 19, 20, -10, 21, 22, -11, 23, 24, -12, 25, 26, -13, 27, 28, -14, 29, 30, -15, 31, 32, -16, 33, 34, -17, 35, 36, -18, 37, 38, -19, 39, 40, -20, 41, 42, -21, 43, 44, -22, 45, 46

Offset: 0

Jaume Oliver Lafont, Oct 18 2009

Setting m=2 in
log(m) = Sum_{n>0} (n mod m - (n-1) mod m)/n [1]
yields the sum
log(2) = (1 -1/2) +(1/3 -1/4) +(1/5 -1/6)+...
Substituting every -1/d by 1/d - 2/d we obtain
log(2) = (1+1/2-1)+(1/3+1/4-1/2)+(1/5+1/6-1/3)+...
a(n) is the sequence of denominators of this modified sum with unit numerators, so
Sum_{k>0} 1/a(k) = log(2)
Substituting -1/d by -2/d + 1/d would yield another permutation (one positive, one negative, one positive) with the same sum of inverses.
Similar sequences (m positives, one negative) may be obtained for the logarithm of any integer m>0. A001057 is the case m=1, with sum of inverses log(1).
Equation [1] is a result of expanding log( Sum_{0<=k<=m-1} x^k ) at x=1 (see comment to A061347.)

G. C. Greubel, Table of n, a(n) for n = 0..10000
Wikipedia, Riemann series theorem
Index entries for linear recurrences with constant coefficients, signature (0,0,2,0,0,-1).

Cf. A001057, A002162, A038608. Signed and shifted version of A009947.

LinearRecurrence[{0, 0, 2, 0, 0, -1}, {0, 1, 2, -1, 3, 4}, 100] (* G. C. Greubel, May 24 2016 *)
Join[{0},With[{nn=50},Riffle[Range[nn],Range[-1,-nn/2,-1],3]]] (* Harvey P. Dale, May 15 2023 *)

PARI
```
a(n)=(2*(n+1)\3)*(1-3/2*!(n%3))
```

a(n)=if(n>=0,[ -n\3, 2*(n\3)+1, 2*(n\3)+2][n%3+1]) \\ Jaume Oliver Lafont, Nov 14 2009

G.f.: (x*(1+2*x-x^2+x^3)/((1-x)^2*(1+x+x^2)^2)).
a(0)=0, a(1)=1, a(2)=2, a(3)=-1, a(4)=3, a(5)=4, a(n)=2*a(n-3)-a(n-6), n>=6.
a(n) = (n+1)/3 +2*A049347(n)/3 -(-1)^n*A076118(n+1). - R. J. Mathar, Oct 30 2009

Corrected by Jaume Oliver Lafont, Oct 22 2009

frac keyword removed by Jaume Oliver Lafont, Nov 02 2009

A210593 Decimal expansion of the series limit of Sum_{k>=1} (-1)^k*log(k)/k^2.

Original entry on oeis.org

1, 0, 1, 3, 1, 6, 5, 7, 8, 1, 6, 3, 5, 0, 4, 5, 0, 1, 8, 8, 6, 0, 0, 2, 8, 8, 2, 2, 1, 2, 2, 4, 2, 1, 8, 3, 6, 5, 9, 3, 8, 4, 7, 7, 6, 3, 7, 4, 9, 1, 1, 1, 6, 3, 3, 3, 4, 2, 9, 4, 2, 4, 7, 1, 9, 6, 2, 0, 4, 5, 3, 0, 9, 2, 0, 5, 4, 3, 6, 3, 2, 4, 9, 5, 3, 1, 7, 8, 0, 1, 2, 5, 3, 1, 9, 0, 3, 5, 6, 3, 9, 8, 2, 3, 1

Offset: 0

R. J. Mathar, Mar 23 2012

First derivative of the Dirichlet eta-function eta(s) at s=2.

Phatisena et al. misspell "Euler" and provide the wrong sign and an invalid 7th digit.

			0.101316578163504501886002882212242183659384776374911163334294247196204...

G. C. Greubel, Table of n, a(n) for n = 0..10000
S. Phatisena, R. E. Amritkar, P. V. Panat, Exchange and correlation potential for a two-dimensional electron gas at finite temperatures, Phys. Rev. A 34 (1986) 5070.
Wikipedia, Dirichlet eta function

Cf. A073002, A013661, A002162, A091812 (s=1), A375506 (s=3/2), A349220 (s=3), A349252 (s=4).

1/2*log(2)*Zeta(2)+Zeta(1,2)/2 ; evalf(%) ;

N[(1/12)*Pi^2*(Log[4] - 12*Log[Glaisher] + Log[Pi] + EulerGamma), 105] // RealDigits // First (* Jean-François Alcover, Feb 05 2013 *)

(log(2)*zeta(2)+zeta'(2))/2 \\ Charles R Greathouse IV, Mar 28 2012

Decimal expansion of (log(2)*zeta(2) + zeta'(2)) / 2.

Extended to 105 digits by Jean-François Alcover, Feb 05 2013

A242024 Decimal expansion of Sum_{n>=1} (-1)^(n+1)6/(n(n+1)*(n+2)).

Original entry on oeis.org

8, 1, 7, 7, 6, 6, 1, 6, 6, 7, 1, 9, 3, 4, 3, 7, 1, 3, 0, 0, 6, 7, 8, 5, 4, 5, 7, 4, 9, 8, 1, 1, 8, 8, 1, 6, 9, 0, 6, 0, 0, 1, 6, 1, 2, 3, 2, 3, 0, 6, 3, 0, 4, 9, 4, 4, 8, 1, 6, 0, 1, 1, 3, 9, 2, 0, 7, 2, 3, 4, 6, 3, 6, 3, 6, 3, 3, 6, 5, 8, 7, 2, 7, 0, 3, 5, 9, 9, 2, 3, 9, 5, 7

Offset: 0

Richard R. Forberg, Aug 11 2014

The sum of the reciprocals of binomial(n,3) for n >= 3 (or A000292(n), for n >= 1) with alternating signs.

Also see A242023.

			0.8177661667193437130067854...

Cf. A242023, A000217, A000292, A000332, A002162.

RealDigits[Chop[Sum[N[(-1)^(n+1)*6/(n*(n+1)*(n+2)),150],{n,1,Infinity}]], 10,120][[1]] (* Harvey P. Dale, Jun 02 2016 *)
RealDigits[12*Log[2] - 15/2, 10, 120][[1]] (* Amiram Eldar, Jun 20 2023 *)

12*log(2) - 15/2 \\ Michel Marcus, Aug 13 2014

sumalt(n=1, (-1)^(n + 1)*6/(n*(n + 1)*(n + 2))) \\ Michel Marcus, Aug 14 2014

Equals 12*log(2) - 15/2.

Prior Mathematica program replaced by Harvey P. Dale, Jun 02 2016

A256128 Decimal expansion of the third Malmsten integral: int_{x=1..infinity} log(log(x))/(1 - x + x^2) dx, negated.

Original entry on oeis.org

6, 7, 1, 7, 1, 9, 6, 0, 1, 8, 8, 5, 8, 7, 4, 5, 4, 2, 3, 5, 4, 4, 0, 5, 0, 6, 9, 2, 8, 8, 7, 7, 9, 8, 8, 4, 0, 0, 8, 8, 0, 2, 0, 6, 6, 2, 1, 9, 3, 5, 6, 3, 3, 2, 0, 5, 3, 6, 1, 6, 7, 3, 3, 7, 5, 1, 2, 5, 1, 2, 1, 7, 1, 7, 5, 8, 6, 1, 9, 0, 2, 1, 8, 3, 2, 6, 7, 1, 2, 6, 8, 6, 2, 9, 3, 2, 3, 7, 2, 3, 5, 5, 0, 3, 6

Offset: 0

Iaroslav V. Blagouchine, Mar 15 2015

			-0.671719601885874542354405069288779884008802066219356...

G. C. Greubel, Table of n, a(n) for n = 0..5000
Iaroslav V. Blagouchine, Rediscovery of Malmsten's integrals, their evaluation by contour integration methods and some related results, The Ramanujan Journal, Volume 35, Issue 1, pp. 21-110, 2014, DOI: 10.1007/s11139-013-9528-5. PDF file
Wikipedia, Carl Malmsten

Cf. A115252 (first Malmsten integral), A256127 (second Malmsten integral), A256129 (fourth Malmsten integral), A073005 (Gamma(1/3)), A002162 (log 2), A002391 (log 3), A053510 (log Pi), A002194 (sqrt 3).

evalf(Pi*(7*log(2)+8*log(Pi)-3*log(3)-12*log(GAMMA(1/3)))/(3*sqrt(3)),120); # Vaclav Kotesovec, Mar 17 2015

RealDigits[Pi*(7*Log[2]+8*Log[Pi]-3*Log[3]-12*Log[Gamma[1/3]])/(3*Sqrt[3]),10,105][[1]] (* Vaclav Kotesovec, Mar 17 2015 *)

Pi*(7*log(2)+8*log(Pi)-3*log(3)-12*log(gamma(1/3)))/(3*sqrt(3)) \\ Michel Marcus, Mar 18 2015

Equals integral_{x=0..1} log(log(1/x))/(1 - x + x^2) dx.
Equals integral_{x=0..infinity} log(x)/(1 - 2*cosh(x)) dx.
Equals Pi*(7*log(2) + 8*log(Pi) - 3*log(3) - 12*log(Gamma(1/3)))/(3*sqrt(3)).

A274181 Decimal expansion of Phi(1/2, 2, 2), where Phi is the Lerch transcendent.

Original entry on oeis.org

3, 2, 8, 9, 6, 2, 1, 0, 5, 8, 6, 0, 0, 5, 0, 0, 2, 3, 6, 1, 0, 6, 2, 5, 2, 8, 0, 6, 3, 8, 7, 2, 0, 4, 3, 4, 9, 7, 6, 7, 9, 3, 8, 9, 9, 2, 2, 4, 5, 0, 5, 7, 0, 1, 7, 3, 7, 3, 8, 8, 1, 9, 1, 4, 9, 2, 6, 8, 4, 1, 7, 6, 2, 8, 6, 7, 3, 2, 8, 0, 3, 2, 6, 7, 3, 6, 1, 2, 7, 4, 3, 5, 1, 6, 6, 3, 4, 2, 8, 7, 4

Offset: 0

Johannes W. Meijer and N. H. G. Baken, Jun 17 2016, Jul 08 2016

The exponential integral distribution is defined by p(x, m, n, mu) = ((n+mu-1)^m * x^(mu-1) / (mu-1)!) * E(x, m, n), see A163931 and the Meijer link. The moment generating function of this probability distribution function is M(a, m, n, mu) = Sum_{k>=0}(((mu+k-1)!/((mu-1)!*k!)) * ((n+mu-1) / (n+mu+k-1))^m * a^k).

In the special case that mu=1 we get p(x, m, n, mu=1) = n^m * E(x, m, n) and M(a, m, n, mu=1) = n^m * Phi(a, m, n), with Phi the Lerch transcendent. If n=1 and mu=1 we get M(a, m, n=1, mu=1) = polylog(m, a)/a = Li_m(a)/a.

			0.32896210586005002361062528063872043497679389922...

William Feller, An introduction to probability theory and its applications, Vol. 1. p. 285, 1968.

J. W. Meijer and N. H. G. Baken, The Exponential Integral Distribution, Statistics and Probability Letters, Volume 5, No. 3, April 1987. pp 209-211.
Eric W. Weisstein’s World of Mathematics, Lerch transcendent.
Eric W. Weisstein’s World of Mathematics, Polylogarithm.

Cf. A163931, A002162 (Phi(1/2, 1, 1)/2), A076788 (Phi(1/2, 2, 1)/2), A112302, A008276.

Digits := 101; c := evalf(LerchPhi(1/2, 2, 2));

N[HurwitzLerchPhi[1/2, 2, 2], 25] (* G. C. Greubel, Jun 19 2016 *)

Pi^2/3 - 2*log(2)^2 - 2 \\ Altug Alkan, Jul 08 2016

lerchphi(.5,2,2) \\ Charles R Greathouse IV, Jan 30 2025

from mpmath import mp, lerchphi
mp.dps=102
print([int(d) for d in list(str(lerchphi(1/2, 2, 2))[2:-1])]) # Indranil Ghosh, Jul 04 2017

Equals Phi(1/2, 2, 2) with Phi the Lerch transcendent.
Equals Sum_{k>=0}(1/((2+k)^2*2^k)).
Equals 4 * polylog(2, 1/2) - 2.
Equals Pi^2/3 - 2*log(2)^2 - 2.
Equals Integral_{x=0..oo} x*exp(-x)/(exp(x)-1/2) dx. - Amiram Eldar, Aug 24 2020

A016643 Decimal expansion of log(20).

Original entry on oeis.org

2, 9, 9, 5, 7, 3, 2, 2, 7, 3, 5, 5, 3, 9, 9, 0, 9, 9, 3, 4, 3, 5, 2, 2, 3, 5, 7, 6, 1, 4, 2, 5, 4, 0, 7, 7, 5, 6, 7, 6, 6, 0, 1, 6, 2, 2, 9, 8, 9, 0, 2, 8, 2, 3, 0, 1, 5, 4, 0, 0, 7, 9, 1, 0, 4, 6, 0, 9, 6, 6, 2, 3, 1, 6, 4, 7, 0, 4, 7, 1, 9, 5, 8, 4, 1, 8, 6, 0, 5, 3, 2, 0, 8, 6, 0, 1, 6, 9, 8, 5, 8, 8, 3, 9, 6

Offset: 1

N. J. A. Sloane

			2.995732273553990993435223576142540775676601622989028230154007910460966...

Milton Abramowitz and Irene A. Stegun, eds., Handbook of Mathematical Functions, National Bureau of Standards Applied Math. Series 55, 1964 (and various reprintings), p. 2.

Harry J. Smith, Table of n, a(n) for n = 1..20000
Milton Abramowitz and Irene A. Stegun, eds., Handbook of Mathematical Functions, National Bureau of Standards, Applied Math. Series 55, Tenth Printing, 1972 [alternative scanned copy].
Index entries for transcendental numbers

Cf. A016448 (continued fraction).

RealDigits[Log[20], 10, 150][[1]] (* Stefan Steinerberger, Apr 09 2006 *)

default(realprecision, 20080); x=log(20); for (n=1, 20000, d=floor(x); x=(x-d)*10; write("b016643.txt", n, " ", d)); \\ Harry J. Smith, May 17 2009, corrected May 20 2009

Equals A002162 + A002392. - R. J. Mathar, Aug 13 2024

More terms from Stefan Steinerberger, Apr 09 2006

A048784 a(n) = tau(binomial(2*n,n)), where tau = number of divisors (A000005).

Original entry on oeis.org

1, 2, 4, 6, 8, 18, 24, 32, 48, 48, 48, 128, 96, 192, 384, 480, 384, 768, 1152, 1536, 2304, 2048, 2048, 3840, 3456, 4608, 6144, 3840, 8192, 20480, 10240, 12288, 18432, 36864, 36864, 49152, 24576, 32768, 98304, 92160, 73728, 245760, 262144

Offset: 0

David Johnson-Davies

nonn

Charles R Greathouse IV, Table of n, a(n) for n = 0..10000
G. V. Fedorov, Number of divisors of the central binomial coefficient, Moscow Univ. Math. Bull., Vol. 68 (2013), pp. 194-197.

Cf. A000005, A000984, A002162.

A048784 := proc(n)
    numtheory[tau](binomial(2*n,n)) ;
end proc:
seq(A048784(n),n=0..30) ; # R. J. Mathar, Jul 12 2024

f[n_] := DivisorSigma[0, Binomial[2 n, n]]; Table[f@n, {n, 0, 42}] (* Robert G. Wilson v, Apr 08 2009 *)

fv(n,p)=my(s);while(n\=p,s+=n);s
a(n)=my(s=1);forprime(p=2,2*n,s*=fv(2*n,p)-2*fv(n,p)+1);s \\ Charles R Greathouse IV, Aug 21 2013

a(n) = A000005(A000984(n)). - Michel Marcus, Aug 21 2013

log(a(n)) = log(2) * (pi(2*n)-pi(n)) + log(2) * (n/log(n)) * Sum_{k=0..T} c_k/log(n)^k + O(n/log(n)^(T+2)) for any T >= 0, where c_k = Sum_{m>=1} Integral_{m+1/2..m+1} log(t)^m/t^2 dt. In particular for T = 0, log(a(n)) = 2 * log(2)^2 * (n/log(n)) + O(n/log(n)^2) (Fedorov, 2013). - Amiram Eldar, Dec 10 2024

A067882 Factorial expansion of log(2) = Sum_{n>=1} a(n)/n!.

Original entry on oeis.org

0, 1, 1, 0, 3, 1, 0, 3, 6, 2, 5, 4, 6, 11, 4, 11, 5, 12, 3, 5, 13, 2, 22, 6, 22, 13, 20, 7, 1, 0, 1, 20, 2, 6, 4, 1, 18, 14, 35, 2, 11, 31, 16, 19, 42, 36, 41, 0, 14, 31, 25, 43, 4, 13, 34, 53, 50, 57, 2, 30, 12, 25, 45, 24, 2, 39, 57, 51, 30, 41, 65, 15, 9, 55, 23, 4, 35, 18, 77, 43

Offset: 1

Benoit Cloitre, Mar 10 2002

			log(2) = 0 + 1/2! + 1/3! + 0/4! + 3/5! + 1/6! + 0/7! + 3/8! + 6/9! + ...

Cf. A002162 (decimal expansion), A016730 (continued fraction).

Cf. A322334 (log(3)), A322333 (log(5)), A068460 (log(7)), A068461 (log(11)).

SetDefaultRealField(RealField(250)); [Floor(Log(2))] cat [Floor(Factorial(n)*Log(2)) - n*Floor(Factorial((n-1))*Log(2)) : n in [2..80]]; // G. C. Greubel, Nov 26 2018

With[{b = Log[2]}, Table[If[n == 1, Floor[b], Floor[n!*b] - n*Floor[(n - 1)!*b]], {n, 1, 100}]] (* G. C. Greubel, Nov 26 2018 *)

default(realprecision, 250); b = log(2); for(n=1, 80, print1(if(n==1, floor(b), floor(n!*b) - n*floor((n-1)!*b)), ", ")) \\ G. C. Greubel, Nov 26 2018

def A067882(n):
    if (n==1): return floor(log(2))
    else: return expand(floor(factorial(n)*log(2)) - n*floor(factorial(n-1)*log(2)))
[A067882(n) for n in (1..80)] # G. C. Greubel, Nov 26 2018

a(n) = floor(n!*log(2)) - n*floor((n-1)!*log(2)).

cp's OEIS Frontend

A074066 Zigzag modulo 3.

Views

Author

Keywords

Comments

Links

Crossrefs

Programs

Haskell

Mathematica

Formula

A092486 Take natural numbers, exchange first and third quadrisection.

Views

Author

Keywords

Links

Crossrefs

Programs

Mathematica

PARI

Formula

A166711 Permutation of the integers: two positives, one negative.

Views

Author

Keywords

Comments

Links

Crossrefs

Programs

Mathematica

PARI

PARI

Formula

Extensions

A210593 Decimal expansion of the series limit of Sum_{k>=1} (-1)^k*log(k)/k^2.

Views

Author

Keywords

Comments

Examples

Links

Crossrefs

Programs

Maple

Mathematica

PARI

Formula

Extensions

A242024 Decimal expansion of Sum_{n>=1} (-1)^(n+1)*6/(n*(n+1)*(n+2)).

Views

Author

Keywords

Comments

Examples

Crossrefs

Programs

Mathematica

PARI

PARI

Formula

Extensions

A256128 Decimal expansion of the third Malmsten integral: int_{x=1..infinity} log(log(x))/(1 - x + x^2) dx, negated.

Views

Author

Keywords

Examples

Links

Crossrefs

Programs

Maple

Mathematica

PARI

Formula

A274181 Decimal expansion of Phi(1/2, 2, 2), where Phi is the Lerch transcendent.

Views

Author

Keywords

Comments

Examples

A242024 Decimal expansion of Sum_{n>=1} (-1)^(n+1)6/(n(n+1)*(n+2)).