A175314 Decimal expansion of exp(Pi) + exp(-Pi).

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, 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, 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

Offset: 2

Author

R. J. Mathar, Apr 01 2010

Keywords

• cons
• nonn

Examples

			23.1839065510430412555035041051202753...
		

Links

• Index entries for transcendental numbers.

Crossrefs

Cf. A039661 (exp(Pi)), A093580 (exp(-Pi)), A175315, A334402 (cosh(Pi)).

Programs

Maple

evalf(exp(Pi)+exp(-Pi)) ;

Mathematica

RealDigits[Exp[Pi]+Exp[-Pi],10,120][[1]] (* Harvey P. Dale, Jan 28 2017 *)

PARI

exp(Pi) + exp(-Pi) \\ Michel Marcus, Jun 27 2019

PARI

2*cosh(Pi) \\ Charles R Greathouse IV, Jan 30 2025

Formula

Equals A039661 + A093580.

Equals 2*cosh(Pi).

Equals 10 * Product_{k>=1} (1 + 4/(2*k+1)^2). - Amiram Eldar, Aug 09 2020