A079076
Numerator of Sum_{1 0} n/k.
0, 0, 3, 4, 65, 27, 203, 236, 3489, 2845, 53471, 21341, 757913, 553973, 619181, 1040164, 29169263, 16276383, 193614199, 116220883, 32925391, 10628013, 320160667, 455451475, 22987116115, 19980510667, 193553388003, 154777722503
Offset: 1
Programs
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Mathematica
f[n_] := Block[{s = 0, d = 1}, While[d < n, If[ Mod[n, d] != 0, s = s + n/d]; d++ ]; s]; Numerator[ Table[ f[n], {n, 1, 28}]]
Formula
p divides a(p^k) for prime p and integer k>1. p divides a(p), a(2p) and a(2p^2) for prime p>2. - Alexander Adamchuk, Jul 27 2006
Extensions
Edited and extended by Robert G. Wilson v, Dec 30 2002