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URL: https://oeis.org/A046898

⇱ A046898 - OEIS


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A046898
Partial sums of A046897.
0
1, 4, 8, 11, 17, 29, 37, 40, 53, 71, 83, 95, 109, 133, 157, 160, 178, 217, 237, 255, 287, 323, 347, 359, 390, 432, 472, 496, 526, 598, 630, 633, 681, 735, 783, 822, 860, 920, 976, 994, 1036, 1132, 1176, 1212, 1290, 1362, 1410, 1422, 1479, 1572, 1644, 1686, 1740, 1860
OFFSET
1,2
FORMULA
G.f.: 1/(1 - q) * Sum_{k>=1} k * q^k / (1 + (-q)^k). - Seiichi Manyama, Jun 21 2024
MATHEMATICA
Accumulate[DivisorSum[#1, # &, Mod[#, 4] != 0 &] & /@ Range[50]] (* Jayanta Basu, Jun 30 2013 *)
PROG
(PARI) my(N=60, q='q+O('q^N)); Vec(sum(k=1, N, k*q^k/(1+(-q)^k))/(1-q)) \\ Seiichi Manyama, Jun 21 2024
CROSSREFS
Cf. A046897.
Sequence in context: A311074 A104655 A309192 * A311075 A311076 A171070
KEYWORD
nonn
EXTENSIONS
Offset changed from 0 to 1 by Seiichi Manyama, Jun 21 2024
STATUS
approved