cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-2 of 2 results.

A018939 Continued fraction for e^Pi - Pi.

Original entry on oeis.org

19, 1, 1110, 11, 1, 2, 2, 2, 2, 1, 61, 3, 2083, 1, 2, 1, 2, 3, 1, 2, 9, 2, 28, 1, 3, 2, 2, 10, 3, 1, 3, 1, 1, 1, 4, 14, 1, 2, 2, 1, 1, 20, 2, 12, 1, 25, 1, 37, 1, 18, 1, 1, 1, 1, 6, 2, 1, 1, 150, 1, 2, 11, 1, 8, 1, 1, 11, 3, 19, 7, 1, 3, 7, 1, 151, 1, 4, 1, 12, 8, 1, 1, 182, 1, 12, 3, 7, 1, 22, 2
Offset: 0

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Keywords

Examples

			19.9990999791894757672664429846690444960689368432251061724701018172...
19.999099979189475767266... = 19 + 1/(1 + 1/(1110 + 1/(11 + 1/(1 + ...)))). - _Harry J. Smith_, May 14 2009
		

Crossrefs

Cf. A018938 (decimal expansion).

Programs

  • Mathematica
    ContinuedFraction[E^Pi-Pi,90] (* Harvey P. Dale, Dec 17 2011 *)
  • PARI
    contfrac(exp(1)^Pi-Pi)
    
  • PARI
    { allocatemem(932245000); default(realprecision, 21000); x=contfrac(exp(1)^Pi-Pi); for (n=1, 20000, write("b018939.txt", n-1, " ", x[n])); } \\ Harry J. Smith, May 14 2009

Extensions

More terms from Jason Earls, Jul 24 2001
Offset changed by Andrew Howroyd, Aug 07 2024

A176696 E.g.f.: exp(6*arcsin(x))-6*arcsin(x).

Original entry on oeis.org

1, 0, 36, 216, 1440, 9936, 74880, 608040, 5391360, 51732000, 539136000, 6055025400, 73322496000, 950831881200, 13198049280000, 194943875747400, 3061947432960000, 50884296047208000, 894088650424320000
Offset: 0

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Author

Jaume Oliver Lafont, Apr 24 2010

Keywords

Comments

Sum_{k>=0} a(k)/(2^k*k!) = e^Pi - Pi (A018938).

Crossrefs

Programs

  • Mathematica
    With[{nn=20},CoefficientList[Series[Exp[6ArcSin[x]]-6ArcSin[x],{x,0,nn}],x] Range[0,nn]!] (* Harvey P. Dale, Mar 11 2012 *)
  • PARI
    a(n)=polcoeff(exp(6*asin(x))-6*asin(x),n)*n!
Showing 1-2 of 2 results.