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 A066060 Number of nilpotent groups of order n. 3
 1, 1, 1, 2, 1, 1, 1, 5, 2, 1, 1, 2, 1, 1, 1, 14, 1, 2, 1, 2, 1, 1, 1, 5, 2, 1, 5, 2, 1, 1, 1, 51, 1, 1, 1, 4, 1, 1, 1, 5, 1, 1, 1, 2, 2, 1, 1, 14, 2, 2, 1, 2, 1, 5, 1, 5, 1, 1, 1, 2, 1, 1, 2, 267, 1, 1, 1, 2, 1, 1, 1, 10, 1, 1, 2, 2, 1, 1, 1, 14, 15, 1, 1, 2, 1, 1, 1, 5, 1, 2, 1, 2, 1, 1, 1, 51, 1, 2, 2, 4, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 COMMENTS Multiplicative with a(p^m) equal to the number of groups of order p^m. LINKS T. D. Noe, Table of n, a(n) for n=1..2015 (using data from A000001) John Renze, Nilpotent Group. MATHEMATICA terms = 101; fgc = FiniteGroupCount[Range[terms]]; a[1] = 1; a[n_ /; PrimePowerQ[n] && 1 < n <= terms] := a[n] = fgc[[n]]; a[n_ /; 1 < n <= terms] := a[n] = Times @@ (a[#[[1]]^#[[2]]]& /@ FactorInteger[n]); Array[a, terms] (* Jean-François Alcover, Oct 03 2017 *) CROSSREFS Cf. A000001, A056867, A069739. Sequence in context: A157249 A155586 A069739 * A008550 A064094 A090182 Adjacent sequences:  A066057 A066058 A066059 * A066061 A066062 A066063 KEYWORD nonn,nice,mult AUTHOR Reiner Martin (reinermartin(AT)hotmail.com), Dec 29 2001 STATUS approved

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Last modified May 26 17:40 EDT 2020. Contains 334630 sequences. (Running on oeis4.)