OFFSET
1,3
LINKS
Eric Weisstein's World of Mathematics, Prime Sums
FORMULA
1/Pi^(2n) * numerator of (zeta(2n)^2-zeta(4n))/(2zeta(2n)).
EXAMPLE
Pi^2/20, Pi^4/1260, (4*Pi^6)/225225, (59*Pi^8)/137837700, ...
CROSSREFS
KEYWORD
nonn,frac
AUTHOR
Eric W. Weisstein, Apr 03 2004
STATUS
approved