A195059 -id:A195059 - cp's OEIS frontend

A195057 Decimal expansion of Pi^2/11.

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

Offset: 0

Omar E. Pol, Oct 04 2011

			0.8972367637353962380758628181705591941194...

G. C. Greubel, Table of n, a(n) for n = 0..5000
Index entries for transcendental numbers

Cf. A002388, A013661, A019678, A072691, A100044, A195059.

Pi(RealField(129))^2/11; // G. C. Greubel, Jun 03 2021

RealDigits[Pi^2/11, 10, 105][[1]] (* T. D. Noe, Oct 05 2011 *)

numerical_approx(pi^2/11, digits=128) # G. C. Greubel, Jun 03 2021

Extended by T. D. Noe, Oct 05 2011

A316499 Intersection of A001694 and A195069.

Original entry on oeis.org

2048, 9216, 13824, 20736, 25600, 31104, 46656, 50176, 64000, 69984, 104976, 115200, 123904, 157464, 160000, 172800, 173056, 175616, 177147, 225792, 236196, 259200, 288000, 338688, 388800, 400000, 432000, 508032, 557568, 583200, 614656, 627200, 648000, 681472, 720000, 762048, 778752, 790272

Offset: 1

Robert Israel, Jul 04 2018

nonn

Powerful(1) numbers k such that A046660(k) = 10.

These are the "primitive" members of A195069, in the sense that A195059 is the set of numbers k*m where k is in this sequence and m is squarefree and coprime to k.

			a(3)=13824 is a member because 13824= 2^9*3^3, 9 and 3 are both greater than 1 and (9-1)+(3-1)=10.

Robert Israel, Table of n, a(n) for n = 1..2528

Cf. A001694, A046660, A195069.

N:= 10^6: # to get all terms <= N
p:= 1:
for i from 1 to 10 do F[i]:= {} od:
do
  p:= nextprime(p);
  if p^2 > N then break fi;
  for i from min(10,floor(log[p](N))-1) to 2 by -1 do F[i]:= F[i] union
    select(`<=`,`union`({p^(i+1)},seq(map(t -> p^(i+1-j)*t, F[j]),j=1..i-1)),N)
  od;
  F[1]:= F[1] union {p^2};
od:
sort(convert(F[10],list));

cp's OEIS Frontend

A195057 Decimal expansion of Pi^2/11.

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