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

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

Offset

1,3

Comments

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

Links

Table of n, a(n) for n=1..9.

Eric Weisstein's World of Mathematics, Wolstenholme's Theorem

Eric Weisstein's World of Mathematics, Harmonic Number

Prog

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

Crossrefs

Denominators are in A228427.

Cf. A001008/A002805.

Sequence in context: A351117 A351138 A171705 * A023928 A022070 A123301

Adjacent sequences: A228423 A228424 A228425 * A228427 A228428 A228429

Keyword

nonn,frac

Author

Ralf Stephan, Nov 10 2013

Status

approved