This really belongs in the fun space. Why was this moved without any discussion? - User 12 ∑ n = 0 ∞ ( − 3 ) − n ( 2 n + 1 ) − 1 {\displaystyle \scriptstyle {\sqrt {12}}\sum _{n=0}^{\infty }(-3)^{-n}(2n+1)^{-1}} 22:34, 12 January 2009 (EST)