A248947 Decimal expansion of Sum_{n >= 1} tan(1/n)^2.

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

Offset: 1

Author

Clark Kimberling, Oct 18 2014

Keywords

• nonn
• easy
• cons

Examples

			3.132799362818005226720034012858567638052280522418872401127192004180544...
		

Links

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

Crossrefs

Cf. A248945, A248946, A248948.

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