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%I #8 Jun 20 2019 02:56:53
%S 2,5,0,9,1,7,8,4,7,8,6,5,8,0,5,6,7,8,2,0,0,9,9,9,5,6,4,3,2,6,9,4,0,5,
%T 9,4,8,2,1,2,0,2,4,3,5,8,1,4,8,1,5,2,2,7,4,0,4,7,9,7,5,6,8,6,1,4,8,9,
%U 8,5,8,9,1,0,8,8,5,3,2,1,3,8,2,6,8,6,5,2,5,2,2,2,2,4,6,5,4,6,9,4,9,9,8,9,0,1,9,9,8,0,2,1,4,6,7,0,7,5,5,3
%N Decimal expansion of cosh(Pi/2).
%F Equals Product_{k>=1} (1 + 1/(2*k - 1)^2).
%F Equals Product_{k>=0} (1 + 1/A016754(k)).
%e 2.50917847865805678200999564326940594821202435...
%t RealDigits[Cosh[Pi/2], 10, 120][[1]]
%o (PARI) cosh(Pi/2) \\ _Michel Marcus_, Jun 20 2019
%Y Cf. A003881, A016754, A156648, A308716.
%K nonn,cons
%O 1,1
%A _Ilya Gutkovskiy_, Jun 19 2019
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