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A060185 Generalized sum of divisors function: second diagonal of A060184. 1
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,4

LINKS

Table of n, a(n) for n=3..75.

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.

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 *)

CROSSREFS

Sequence in context: A251725 A292977 A295381 * A129110 A257101 A112624

Adjacent sequences:  A060182 A060183 A060184 * A060186 A060187 A060188

KEYWORD

easy,sign

AUTHOR

N. J. A. Sloane, Mar 19 2001

EXTENSIONS

More terms from Vladeta Jovovic, Nov 11 2001

STATUS

approved

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Last modified October 21 02:22 EDT 2018. Contains 316405 sequences. (Running on oeis4.)