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

1,1

Links

Table of n, a(n) for n=1..105.

Example

2.071121329967823169571572992683526260893794658306930755815650661114451...

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]]

Prog

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

Crossrefs

Cf. A185393, A254446, A335415.

Sequence in context: A156442 A268683 A174968 * A346670 A140663 A198108

Adjacent sequences: A254442 A254443 A254444 * A254446 A254447 A254448

Keyword

nonn,cons

Author

Vaclav Kotesovec, Jan 30 2015

Status

approved