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A112020 Number of partitions of n into distinct semiprimes. 7
1, 0, 0, 0, 1, 0, 1, 0, 0, 1, 2, 0, 0, 1, 2, 2, 1, 0, 1, 3, 2, 2, 1, 2, 3, 5, 2, 2, 3, 5, 4, 5, 3, 4, 6, 9, 6, 5, 6, 10, 10, 9, 7, 9, 12, 14, 12, 11, 14, 18, 17, 16, 16, 19, 21, 24, 21, 23, 26, 29, 30, 32, 31, 33, 39, 40, 39, 41, 45, 49, 54, 53, 54, 59, 68, 66, 68, 70, 78, 82, 88, 86, 93, 101 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,11

LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..1000

MATHEMATICA

nmax = 100;

CoefficientList[Series[Product[1+x^(Prime[j] Prime[k]), {j, 1, nmax}, {k, j, nmax}], {x, 0, nmax}], x] (* Jean-Fran├žois Alcover, Nov 10 2021 *)

CROSSREFS

Cf. A101048, A112022, A001358, A000586.

Sequence in context: A205593 A277937 A334913 * A069160 A089616 A089615

Adjacent sequences:  A112017 A112018 A112019 * A112021 A112022 A112023

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Aug 26 2005

STATUS

approved

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Last modified January 19 22:12 EST 2022. Contains 350466 sequences. (Running on oeis4.)