A248949 Decimal expansion of sum_{n >= 1} (sin(2/n))^2.

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

Offset

1,1

Links

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

Example

3.0136580258100591762101955819548270224075442567134903998883672964281449...

Maple

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

Mathematica

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

Prog

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

Crossrefs

Cf. A248946, A248947, A248950.

Sequence in context: A320801 A035623 A350178 * A325673 A083857 A353077

Adjacent sequences: A248946 A248947 A248948 * A248950 A248951 A248952

Keyword

nonn,easy,cons

Author

Clark Kimberling, Oct 18 2014

Status

approved