A275408 Decimal expansion of Pi/(4*log(2)).

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

Offset

1,3

Links

Table of n, a(n) for n=1..87.

Formula

Equals (Sum_{n>=0} (-1)^n/(2*n+1)) / (Sum_{n>=1} (-1)^(n+1)/n) = A003881 / A002162.

Equals Integral_{x=0..oo} 1/(2^x + 2^(-x)) dx. - Amiram Eldar, Jul 16 2020

Example

1.133090035456798452406920736429166702542965366930948896046504136985...

Mathematica

A275408L[n_] := RealDigits[Pi/(4 Log[2]), 10, n][[1]]; A275408L[50] (* JungHwan Min, Jul 29 2016 *)

Prog

(PARI) Pi/(4*log(2)) \\ Michel Marcus, Jul 27 2016

Crossrefs

Cf. A002162, A003881, A185280 (Inverse).

Sequence in context: A093755 A176276 A200701 * A169670 A372004 A341748

Adjacent sequences: A275405 A275406 A275407 * A275409 A275410 A275411

Keyword

nonn,cons

Author

Terry D. Grant, Jul 26 2016

Extensions

More digits from Jon E. Schoenfield, Mar 15 2018

Status

approved