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A189344
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Numbers with prime factorization pq^2r^2s^2.
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1
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6300, 8820, 9900, 11700, 14700, 15300, 17100, 19404, 20700, 21780, 22050, 22932, 26100, 27900, 29988, 30420, 30492, 33300, 33516, 36300, 36900, 38700, 40572, 42300, 42588, 47700, 50700, 51156, 52020, 53100, 53900, 54450, 54684, 54900
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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f[n_]:=Sort[Last/@FactorInteger[n]]=={1, 2, 2, 2}; Select[Range[90000], f]
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PROG
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(PARI) list(lim)=my(v=List(), t1, t2, t3); forprime(p=2, sqrtint(lim\180), t1=p^2; forprime(q=2, sqrtint(lim\(12*t1)), if(q==p, next); t2=q^2*t1; forprime(r=2, sqrtint(lim\(2*t2)), if(r==p || r==q, next); t3=r^2*t2; forprime(s=2, lim\t3, if(s==p || s==q || s==r, next); listput(v, t3*s))))); Set(v) \\ Charles R Greathouse IV, Aug 25 2016
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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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