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A088367 Decimal expansion of Grothendieck's constant Pi/(2*log(1+sqrt(2))). 4
1, 7, 8, 2, 2, 1, 3, 9, 7, 8, 1, 9, 1, 3, 6, 9, 1, 1, 1, 7, 7, 4, 4, 1, 3, 4, 5, 2, 9, 7, 2, 5, 4, 9, 3, 4, 0, 7, 9, 1, 7, 3, 1, 9, 0, 9, 7, 7, 3, 2, 3, 9, 3, 8, 1, 0, 2, 4, 9, 5, 9, 9, 5, 6, 8, 8, 5, 1, 5, 4, 1, 2, 8, 7, 6, 3, 7, 8, 4, 0, 8, 0, 2, 4, 3, 1, 6, 7, 6, 6, 3, 5, 7, 8, 2, 5, 5, 3, 0, 8, 9, 3 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

G. C. Greubel, Table of n, a(n) for n = 1..20000

N. Alon et al., Quadratic forms on graphs, preprint.

N. Alon et al., Quadratic forms on graphs, Inventiones Math., 163 (2006), 499-522.

Simon Plouffe, Grothendieck's majorant

Eric Weisstein's World of Mathematics, Grothendieck's Constant

EXAMPLE

1.7822139781913691117744134529725493407917319097732...

MATHEMATICA

RealDigits[Pi/(2*Log[1 + Sqrt[2]]), 10, 111][[1]] (* Robert G. Wilson v, May 19 2004 *)

PROG

(PARI) Pi/(2*log(1 + sqrt(2))) \\ G. C. Greubel, Mar 27 2018

(MAGMA) SetDefaultRealField(RealField(150)); R:= RealField(); Pi(R)/(2*Log(1 + Sqrt(2))) // G. C. Greubel, Mar 27 2018

CROSSREFS

Sequence in context: A154169 A245260 A128755 * A196610 A198938 A244067

Adjacent sequences:  A088364 A088365 A088366 * A088368 A088369 A088370

KEYWORD

nonn,cons

AUTHOR

Eric W. Weisstein, Sep 27 2003

EXTENSIONS

Edited by N. J. A. Sloane, Oct 01 2006

STATUS

approved

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Last modified October 19 16:07 EDT 2019. Contains 328223 sequences. (Running on oeis4.)