OFFSET
0,3
FORMULA
chi3(k) = Kronecker(-3, k); chi3(k) is 0, 1, -1 when k reduced modulo 3 is 0, 1, 2, respectively; chi3 is A102283.
Series: L(2, chi3) = sum_{k=1..infinity} chi3(k) k^{-2} = 1 - 1/2^2 + 1/4^2 - 1/5^2 + 1/7^2 - 1/8^2 + 1/10^2 - 1/11^2 + ...
EXAMPLE
L(2, chi3) = 0.781302412896486296867187429624092... = A086724 = = [0; 1, 3, 1, 1, 2, 1, 17, 1, 10, 1, 1, 5, 1, 1, 2, 1, ...]
MATHEMATICA
nmax = 1000; ContinuedFraction[(Zeta[2, 1/3] - Zeta[2, 2/3])/9, nmax + 1]
PROG
(PARI) contfrac(zetahurwitz(2, 1/3)/9 - zetahurwitz(2, 2/3)/9) \\ Charles R Greathouse IV, Jan 31 2018
CROSSREFS
KEYWORD
nonn,cofr,easy
AUTHOR
Stuart Clary, Dec 17 2008
STATUS
approved