login
Decimal expansion of cosh(sqrt(3)*Pi/2)*sech(Pi/2).
1

%I #8 Jun 20 2019 02:57:15

%S 3,0,4,0,1,9,1,5,5,1,6,4,2,5,5,3,0,7,5,6,0,1,8,6,0,0,2,7,9,0,0,7,5,7,

%T 2,3,3,8,2,3,8,5,4,9,0,5,8,7,9,1,7,1,6,7,7,9,4,1,6,5,9,7,5,1,8,4,0,8,

%U 8,5,3,9,2,5,2,3,3,2,0,4,4,1,9,6,5,1,4,6,1,8,2,9,9,0,2,5,5,0,2,1,9,7,1,1,2,0,4,8,3,0,3,9,2,2,3,1,0,5,0,6

%N Decimal expansion of cosh(sqrt(3)*Pi/2)*sech(Pi/2).

%F Equals Product_{k>=0} (1 + 1/(2*k*(k + 1) + 1)).

%F Equals Product_{k>=0} (1 + 1/A001844(k)).

%e 3.040191551642553075601860027900757233823854905879...

%t RealDigits[Cosh[Sqrt[3] Pi/2] Sech[Pi/2], 10, 120][[1]]

%o (PARI) cosh(sqrt(3)*Pi/2)/cosh(Pi/2) \\ _Michel Marcus_, Jun 20 2019

%Y Cf. A001844, A156648, A308642, A308718.

%K nonn,cons

%O 1,1

%A _Ilya Gutkovskiy_, Jun 19 2019