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A047966
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a(n) = Sum_{ d divides n } q(d), where q(d) = A000009 = number of partitions of d into distinct parts.
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5
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1, 2, 3, 4, 4, 8, 6, 10, 11, 15, 13, 25, 19, 29, 33, 42, 39, 62, 55, 81, 84, 103, 105, 153, 146, 185, 203, 253, 257, 344, 341, 432, 463, 552, 594, 747, 761, 920, 1003, 1200, 1261, 1537, 1611, 1921, 2089, 2410, 2591, 3095, 3270, 3815, 4138, 4769
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Number of partitions of n such that every part occurs with the same multiplicity. - Vladeta Jovovic (vladeta(AT)eunet.rs), Oct 22 2004
Contribution from Gary W. Adamson (qntmpkt(AT)yahoo.com), Jun 08 2009: (Start)
Equals inverse Mobius transform (A051731) * A000009, where the latter begins
(1, 1, 2, 2, 3, 4, 5, 6, 8,...) (End)
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LINKS
| T. D. Noe, Table of n, a(n) for n=1..1000
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FORMULA
| G.f.: Sum_{k>0} (-1+Product_{i>0} (1+z^(k*i))). - Vladeta Jovovic (vladeta(AT)eunet.rs), Jun 22 2003
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CROSSREFS
| Cf. A000009, A024994, A047968.
Sequence in context: A006087 A136330 A028298 * A097093 A056877 A202784
Adjacent sequences: A047963 A047964 A047965 * A047967 A047968 A047969
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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