A132715 Decimal expansion of 25/Pi.

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

Offset

1,1

Comments

Starting with 0, 0, 7, 9, 5, ... this is also the decimal expansion of 1/(4*Pi). Example: 0.079577471545947667884441881686257181... - Omar E. Pol, Jan 18 2013

Links

Table of n, a(n) for n=1..105.

Srinivasa Ramanujan, Question 463, Journal of the Indian Mathematical Society, Vol. 5 (1913), p. 120.

Index entries for transcendental numbers.

Formula

1/(4*Pi) = Integral_{x>=0} cos(Pi*x/2)/(exp(2*Pi*sqrt(x))-1) dx (Ramanujan, 1913). - Amiram Eldar, Jan 01 2025

Example

7.9577471545947667884441881686257181...

Mathematica

RealDigits[25/Pi, 10, 120][[1]] (* Harvey P. Dale, Nov 24 2012 *)

Prog

(PARI) 25/Pi \\ Charles R Greathouse IV, Oct 01 2022
(Magma) R:= RealField(100); 25/Pi(R); // Vincenzo Librandi, Jan 01 2025

Crossrefs

Cf. A049541, A060294, A089491, A088538, A086201, A132696 to A132699, A132701, A132702.

Sequence in context: A198417 A363687 A215736 * A154910 A063603 A218360

Adjacent sequences: A132712 A132713 A132714 * A132716 A132717 A132718

Keyword

cons,easy,nonn

Author

Omar E. Pol, Aug 31 2007, Dec 30 2008

Extensions

More digits from R. J. Mathar, Aug 17 2009

Status

approved