A093598 Denominator of Sum_{k in A026424} 1/k^(2n).
20, 1260, 225225, 137837700, 49104680625, 3277766894527125, 61902833536293750, 396627372338514817500, 7794458831536571762427234375, 2289686345687357378035370971875, 146008313505589229344287856968750
Offset: 1
Examples
Pi^2/20, Pi^4/1260, (4*Pi^6)/225225, (59*Pi^8)/137837700, ...
Links
- Eric Weisstein's World of Mathematics, Prime Sums
Formula
Denominator of (zeta(2n)^2-zeta(4n))/(2zeta(2n)).