%I #19 Aug 09 2020 17:04:16
%S 2,3,1,8,3,9,0,6,5,5,1,0,4,3,0,4,1,2,5,5,5,0,3,5,0,4,1,0,5,1,2,0,2,7,
%T 5,3,9,1,5,4,1,8,3,4,3,5,2,4,1,0,8,4,5,0,7,6,4,2,5,7,6,6,0,9,6,9,2,5,
%U 3,9,3,1,1,6,4,4,7,4,7,0,7,5,1,2,1,5,1,1,1,9,5,7,0,2,9,4,5,0,3,0,4,0,6,2,9
%N Decimal expansion of exp(Pi) + exp(-Pi).
%F Equals A039661 + A093580.
%F Equals 2*cosh(Pi).
%F Equals 10 * Product_{k>=1} (1 + 4/(2*k+1)^2). - _Amiram Eldar_, Aug 09 2020
%e 23.1839065510430412555035041051202753...
%p evalf(exp(Pi)+exp(-Pi)) ;
%t RealDigits[Exp[Pi]+Exp[-Pi],10,120][[1]] (* _Harvey P. Dale_, Jan 28 2017 *)
%o (PARI) exp(Pi) + exp(-Pi) \\ _Michel Marcus_, Jun 27 2019
%Y Cf. A039661 (exp(Pi)), A093580 (exp(-Pi)), A175315, A334402 (cosh(Pi)).
%K cons,nonn
%O 2,1
%A _R. J. Mathar_, Apr 01 2010
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