A254445 Decimal expansion of Sum_{n>=0} 1/cosh(n).

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

Offset: 1

Author

Vaclav Kotesovec, Jan 30 2015

Keywords

• nonn
• cons

Examples

			2.071121329967823169571572992683526260893794658306930755815650661114451...
		

Crossrefs

Cf. A185393, A254446, A335415.

Programs

Maple

evalf(sum(1/cosh(n), n = 0..infinity), 120);

Mathematica

RealDigits[N[Re[Sum[1/Cosh[n],{n,0,Infinity}]],110],10,105][[1]]

PARI

suminf(n=0, 1/cosh(n)) \\ Michel Marcus, Jan 30 2015