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A275408 Decimal expansion of Pi/(4*log(2)). 1
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 (list; constant; graph; refs; listen; history; text; internal format)
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 A341748 A120981

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

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Last modified October 19 09:22 EDT 2021. Contains 348074 sequences. (Running on oeis4.)