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A224273 Decimal expansion of Baxter's four-coloring constant. 2
1, 4, 6, 0, 9, 9, 8, 4, 8, 6, 2, 0, 6, 3, 1, 8, 3, 5, 8, 1, 5, 8, 8, 7, 3, 1, 1, 7, 8, 4, 6, 0, 5, 9, 6, 9, 7, 0, 3, 8, 9, 3, 1, 3, 5, 5, 8, 0, 7, 4, 6, 1, 7, 8, 8, 2, 0, 5, 7, 7, 5, 4, 3, 4, 4, 4, 1, 5, 2, 1, 3, 5, 5, 8, 8, 5, 7, 3, 1, 4, 4, 0, 7, 7, 6, 5, 3 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..5000

Eric Weisstein's World of Mathematics, Baxter's Four-Coloring Constant.

FORMULA

Equals 1/product(1-1/(3n-1)^2, n>=1) = 3*Gamma(1/3)^3/(4*Pi^2).

EXAMPLE

1.46099848620631835815887311784605969703893135580746178820577543...

MATHEMATICA

RealDigits[3 Gamma[1/3]^3/(4 Pi^2), 10, 90][[1]]

CROSSREFS

Sequence in context: A200349 A021221 A197006 * A285444 A285584 A316386

Adjacent sequences:  A224270 A224271 A224272 * A224274 A224275 A224276

KEYWORD

nonn,cons

AUTHOR

Bruno Berselli, Apr 02 2013

STATUS

approved

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Last modified October 22 00:52 EDT 2019. Contains 328315 sequences. (Running on oeis4.)