A092349 a(n) = sigma_3(n) - sigma_2(n).

0, 4, 18, 52, 100, 202, 294, 500, 666, 1004, 1210, 1834, 2028, 2846, 3268, 4340, 4624, 6358, 6498, 8652, 9132, 11378, 11638, 15530, 15100, 18932, 19620, 24062, 23548, 30452, 28830, 36084, 36076, 42776, 42044, 53350, 49284, 59930, 59844, 71500, 67240, 84188

Offset

1,2

Links

Table of n, a(n) for n=1..42.

Formula

G.f.: Sum_{k>=1} k^2*(k - 1)*x^k/(1 - x^k). - Ilya Gutkovskiy, Mar 17 2017

Crossrefs

Cf. A001157, A001158.

Sequence in context: A256431 A256430 A225263 * A027659 A059133 A300493

Adjacent sequences: A092346 A092347 A092348 * A092350 A092351 A092352

Keyword

nonn

Author

N. J. A. Sloane, Mar 20 2004

Status

approved