A074596 Numerator of 3 * H(n,3,1), a generalized harmonic number. See A075135.

3, 15, 117, 627, 8571, 35649, 699171, 7898361, 40404717, 41219817, 1300637127, 22464584559, 843217244283, 854342788713, 37181761691859, 864748487122557, 6116114629522299, 6175362432667599, 6231378537459519, 182250420468103851

Offset: 1

Author

Robert G. Wilson v, Aug 27 2002

Keywords

• easy
• frac
• nonn

Crossrefs

The denominators are in A051536.

Cf. A075135.

Programs

Mathematica

Table[ Numerator[ Sum[1/i, {i, 1/3, n}]], {n, 1, 20}]

Extensions

a(15) corrected by Sean A. Irvine, Jan 22 2025