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A303946
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Numbers that are neither squarefree nor perfect powers.
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4
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12, 18, 20, 24, 28, 40, 44, 45, 48, 50, 52, 54, 56, 60, 63, 68, 72, 75, 76, 80, 84, 88, 90, 92, 96, 98, 99, 104, 108, 112, 116, 117, 120, 124, 126, 132, 135, 136, 140, 147, 148, 150, 152, 153, 156, 160, 162, 164, 168, 171, 172, 175, 176, 180, 184, 188, 189
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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MAPLE
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filter:= proc(n) local F;
F:= map(t->t[2], ifactors(n)[2]);
max(F)>1 and igcd(op(F))=1
end proc:
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MATHEMATICA
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Select[Range[200], !SquareFreeQ[#] && GCD@@FactorInteger[#][[All, 2]] == 1 &]
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PROG
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(PARI) isok(n) = !issquarefree(n) && !ispower(n); \\ Michel Marcus, May 05 2018
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CROSSREFS
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Cf. A000009, A000837, A001597, A005117, A007916, A013929, A047966, A052409, A052410, A072774, A073576, A126706, A132350.
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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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