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 A117221 Number of partitions of 3-smooth numbers. 6
 1, 2, 3, 5, 11, 22, 30, 77, 231, 385, 1575, 3010, 8349, 17977, 147273, 386155, 1741630, 5392783, 18004327, 118114304, 483502844, 4351078600, 22540654445, 129913904637, 1987276856363, 15285151248481, 133978259344888, 365749566870782, 3925922161489422, 49005643635237875 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Andrew Howroyd, Table of n, a(n) for n = 1..100 FORMULA a(n) = A000041(A003586(n)). MATHEMATICA PartitionsP /@ Select[Range[1000], AllTrue[FactorInteger[#][[All, 1]], # <= 3 &] &] (* Jean-François Alcover, Oct 13 2021 *) PROG (PARI) \\ here is(n) is test for A003586 inclusion. is(n)={forprime(p=2, 3, n/=p^valuation(n, p)); n==1} seq(n)={my(A=List(), i=0); while(#A

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Last modified August 15 13:43 EDT 2024. Contains 375173 sequences. (Running on oeis4.)