A122143 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

A122143

Decimal expansion of Sum_{k >= 1} cos(k)/k^2.

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

(list; constant; graph; refs; listen; history; text; internal format)

OFFSET

0,1

COMMENTS

Also, decimal expansion of the real part of Sum_{k>=1} e^(i*k)/k^2. [Bruno Berselli, Mar 24 2013]

LINKS

Table of n, a(n) for n=0..103.

FORMULA

Equals (2*Pi*(Pi-3)+3)/12.

EXAMPLE

0.324137740053329817241093475006273747120365201519245527248085933216...

MATHEMATICA