A248948 Decimal expansion of Sum_{n >= 1} tan(1/n^2).

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

Offset: 1

Author

Clark Kimberling, Oct 18 2014

Keywords

• nonn
• easy
• cons

Examples

			2.208258813287175709084349680730347326245868074198770676727659915398266...
		

Links

• Vaclav Kotesovec, Table of n, a(n) for n = 1..500

Crossrefs

Cf. A248945, A248946, A248947.

Programs

Maple

evalf(sum(tan(1/n^2), n=1..infinity), 120); # Vaclav Kotesovec, Oct 20 2014

Mathematica

(* N[Sum[Tan[1/n^2], {n, 1, Infinity}], 120], yields only 25 correct decimals *)

PARI

default(realprecision,120); sumpos(n=1,tan(1/n^2)) \\ Vaclav Kotesovec, Oct 20 2014