A060185 Generalized sum of divisors function: second diagonal of A060184.

1, 0, 1, 2, 1, 1, 1, 6, -1, 5, -3, 10, 0, 9, -7, 16, -9, 17, -6, 22, -13, 20, -15, 28, -14, 35, -23, 36, -25, 36, -24, 42, -26, 53, -37, 50, -34, 58, -45, 60, -49, 75, -37, 66, -55, 77, -59, 74, -60, 101, -71, 88, -64, 106, -74, 92, -83, 124, -89, 98, -79, 130, -90, 120, -105, 155, -104, 120, -113, 163, -121, 126, -111

Offset: 3

Author

N. J. A. Sloane, Mar 19 2001

Keywords

• easy
• sign

Links

• P. A. MacMahon, Divisors of numbers and their continuations in the theory of partitions, Proc. London Math. Soc., (2) 19 (1919), 75-113; Coll. Papers II, pp. 303-341.

Programs

Mathematica

max = 80; s = Sum[q^(m1 + m2)/((1 + q^m1)*(1 + q^m2)), {m1, 1, max-1}, {m2, m1+1, max}]; CoefficientList[Series[s, {q, 0, max}] , q][[4 ;; max]] (* Jean-François Alcover, Jan 21 2014 *)

Extensions

More terms from Vladeta Jovovic, Nov 11 2001