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A189990
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Numbers with prime factorization p^2*q^6.
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9
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576, 1600, 2916, 3136, 7744, 10816, 18225, 18496, 23104, 33856, 35721, 53824, 61504, 62500, 87616, 88209, 107584, 118336, 123201, 140625, 141376, 179776, 210681, 222784, 238144, 263169, 287296, 322624, 341056, 385641, 399424, 440896, 470596
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OFFSET
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1,1
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LINKS
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FORMULA
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MATHEMATICA
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f[n_]:=Sort[Last/@FactorInteger[n]]=={2, 6}; Select[Range[800000], f]
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PROG
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(PARI) list(lim)=my(v=List(), t); forprime(p=2, (lim\4)^(1/6), t=p^6; forprime(q=2, sqrt(lim\t), if(p==q, next); listput(v, t*q^2))); vecsort(Vec(v)) \\ Charles R Greathouse IV, Jul 24 2011
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CROSSREFS
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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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