23 Nov
2007
23 Nov
'07
9:47 a.m.
Hi, answering myself... regarding
Catalan prod_{odd primes p} (1 - (-1)^((p-1)/2)/p^2) = 1.
e.g. http://www.mathcad.com/library/Constants/catalan.htm contains this as \beta(2), where \beta is the Dirichlet beta function, which is a special form of a Dirichlet L series. so everything is well known. Christoph