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A036330
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Composite numbers n such that juxtaposition of prime factors of n has length 6.
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1
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64, 96, 144, 160, 176, 208, 216, 224, 240, 264, 272, 304, 312, 324, 336, 360, 368, 396, 400, 408, 440, 456, 464, 468, 484, 486, 496, 504, 520, 540, 552, 560, 572, 592, 594, 600, 612, 616, 656, 660, 676, 680, 684, 688, 696, 702, 726, 728, 729, 744, 748, 752
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OFFSET
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1,1
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COMMENTS
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The last term of this sequence is a(96411)=994009.
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LINKS
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MAPLE
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isA036330 := proc(n) local d: d:=ifactors(n)[2]: return `if`(not isprime(n) and add(length(d[j][1])*d[j][2], j=1..nops(d))=6, n, NULL): end: seq(isA036330(n), n=2..752); # Nathaniel Johnston, Jun 22 2011
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MATHEMATICA
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pf6Q[n_]:=!PrimeQ[n]&&Total[Last[#]IntegerLength[First[#]]&/@FactorInteger[ n]]==6; Select[Range[800], pf6Q] (* Harvey P. Dale, Jun 19 2012 *)
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CROSSREFS
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KEYWORD
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nonn,base,fini,easy
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AUTHOR
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STATUS
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approved
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