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]
FORMULA
Equals (2*Pi*(Pi-3)+3)/12.
EXAMPLE
0.324137740053329817241093475006273747120365201519245527248085933216...
MATHEMATICA
Print[x=FullSimplify[Sum[Cos[n]/n^2, {n, Infinity}]]]; RealDigits[N[x, 110]][[1]]
PROG
(PARI) (2*Pi*(Pi-3)+3)/12 \\ Jianing Song, Nov 09 2019
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
T. D. Noe, Aug 28 2006
STATUS
approved