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A330976
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Numbers that are not the number of factorizations into factors > 1 of any positive integer.
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23
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6, 8, 10, 13, 14, 17, 18, 20, 23, 24, 25, 27, 28, 32, 33, 34, 35, 37, 39, 40, 41, 43, 44, 46, 48, 49, 50, 51, 53, 54, 55, 58, 59, 60, 61, 62, 63, 65, 68, 69, 70, 71, 72, 73, 75, 76, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 93, 94, 95, 96, 99
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OFFSET
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1,1
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COMMENTS
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Warning: I have only confirmed the first eight terms. The rest are derived from A045782. - Gus Wiseman, Jan 07 2020
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LINKS
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MATHEMATICA
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nn=15;
fam[n_]:=fam[n]=If[n<=1, {{}}, Join@@Table[Map[Prepend[#, d]&, Select[fam[n/d], Min@@#>=d&]], {d, Rest[Divisors[n]]}]];
nds=Length/@Array[fam[#]&, 2^nn];
Complement[Range[nn], nds]
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CROSSREFS
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The least number with n factorizations is A330973(n).
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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