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A092348 a(n) = sigma_3(n) - sigma_1(n). 4
0, 6, 24, 66, 120, 240, 336, 570, 744, 1116, 1320, 2016, 2184, 3072, 3504, 4650, 4896, 6774, 6840, 9156, 9600, 11952, 12144, 16320, 15720, 19740, 20400, 25056, 24360, 31680, 29760, 37386, 37248, 44172, 43296, 55170, 50616, 61680, 61488, 73620, 68880, 86592 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
FORMULA
G.f.: Sum_{k>=1} k*(k^2 - 1)*x^k/(1 - x^k). - Ilya Gutkovskiy, Mar 17 2017
G.f.: 6 * Sum_{k>0} x^(2*k)/(1-x^k)^4. - Seiichi Manyama, Jun 11 2023
PROG
(PARI) a(n) = sigma(n, 3)-sigma(n); \\ Seiichi Manyama, Jun 11 2023
CROSSREFS
Sequence in context: A344508 A101877 A270851 * A274772 A369177 A234271
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Mar 20 2004
STATUS
approved

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Last modified February 21 06:16 EST 2024. Contains 370219 sequences. (Running on oeis4.)