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A088375
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Decimal expansion of a postulated upper estimate for the complex Grothendieck constant.
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4
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1, 4, 0, 4, 5, 7, 5, 9, 3, 4, 6, 6, 3, 7, 4, 2, 0, 3, 2, 7, 7, 3, 9, 5, 8, 4, 7, 1, 5, 4, 8, 1, 4, 3, 7, 4, 3, 2, 3, 4, 6, 1, 1, 8, 3, 0, 6, 5, 2, 7, 1, 1, 9, 3, 6, 1, 1, 8, 0, 8, 9, 6, 1, 8, 5, 8, 7, 7, 1, 7, 1, 9, 4, 4, 8, 2, 5, 7, 7, 2, 2, 9, 8, 6, 5, 2, 8, 9, 8, 6, 2, 7, 0, 8, 7, 4, 4, 7, 8, 9, 3, 5
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OFFSET
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1,2
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LINKS
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FORMULA
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Equals (sqrt(8*Pi)*Gamma(3/4)^2)/(Pi^2 - 2*Gamma(3/4)^4). - Jan Mangaldan, Nov 23 2020
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EXAMPLE
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1.404575934663742032773958471548143743234611830652711936118...
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MAPLE
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Re(evalf(1/(2*EllipticK(I)-EllipticE(I)), 120)); # Vaclav Kotesovec, Apr 22 2015
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MATHEMATICA
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RealDigits[(Sqrt[8 Pi] Gamma[3/4]^2)/(Pi^2 - 2 Gamma[3/4]^4), 10, 102][[1]] (* Jan Mangaldan, Nov 23 2020 *)
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PROG
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(PARI) magm(a, b)=my(eps=10^-(default(realprecision)-5), c); while(abs(a-b)>eps, my(z=sqrt((a-c)*(b-c))); [a, b, c] = [(a+b)/2, c+z, c-z]); (a+b)/2
E(x)=Pi/2/agm(1, sqrt(1-x))*magm(1, 1-x)
K(x)=Pi/2/agm(1, sqrt(1-x))
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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