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 A126706 Positive integers which are neither squarefree integers nor prime powers. 13
 12, 18, 20, 24, 28, 36, 40, 44, 45, 48, 50, 52, 54, 56, 60, 63, 68, 72, 75, 76, 80, 84, 88, 90, 92, 96, 98, 99, 100, 104, 108, 112, 116, 117, 120, 124, 126, 132, 135, 136, 140, 144, 147, 148, 150, 152, 153, 156, 160, 162, 164, 168, 171, 172, 175, 176, 180, 184, 188 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Michael De Vlieger, Table of n, a(n) for n = 1..10000 EXAMPLE 45 is in the sequence because 45=3^2*5, i.e., neither squarefree nor a prime power. MAPLE with(numtheory): a:=proc(n) if mobius(n)=0 and nops(factorset(n))>1 then n else fi end: seq(a(n), n=1..230); # Emeric Deutsch, Feb 17 2007 MATHEMATICA Select[Range[200], Max @@ Last /@ FactorInteger[ # ] >1 && Length[FactorInteger[ # ]] > 1 &] (* Ray Chandler, Feb 17 2007 *) CROSSREFS Cf. A005117, A000961, A059404. Sequence in context: A007624 A036456 A102467 * A123711 A200511 A317711 Adjacent sequences:  A126703 A126704 A126705 * A126707 A126708 A126709 KEYWORD nonn AUTHOR Leroy Quet, Feb 11 2007 EXTENSIONS Extended by Emeric Deutsch and Ray Chandler, Feb 17 2007 STATUS approved

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Last modified May 28 21:37 EDT 2020. Contains 334690 sequences. (Running on oeis4.)