A228426 Numerator of Sum(i=1..n-1, 1/i^(2*n-1)).

0, 1, 33, 282251, 5170139875, 36297634492764230063, 43540989124396091246149, 248033379485570104849994099153187946961, 17204019459451797001978107903201762504044841332131

Offset: 1

Author

Ralf Stephan, Nov 10 2013

Keywords

• nonn
• frac

Comments

For prime p, p^3 divides a(p), see A130681.

Links

• Eric Weisstein's World of Mathematics, Wolstenholme's Theorem
• Eric Weisstein's World of Mathematics, Harmonic Number

Crossrefs

Denominators are in A228427.

Cf. A001008/A002805.

Programs

PARI

a(n)=numerator(sum(i=1,n-1,1/i^(2*n-1)))