rwg>e.g., with z=1/4, 7 zeta(3) --------- + 1/8 inf 2 /===\ - 1/4 8 %pi | | %e %e | | ------------ = -----------------. | | 2 1/4 n = 1 1 n 2 (1 - ----) 2 4 n Or with z = 1/9, inf /===\ - 1/9 | | %e | | ------------ = | | 2 n = 1 1 n (1 - ----) 2 9 n sqrt(3) Psi (1/3) 13 zeta(3) 1 2 sqrt(3) %pi ---------- - ----------------- + ------------- + 1/18 2 27 %pi 81 18 %pi %e ------------------------------------------------------- 1/18 3