A190467 Numbers with prime factorization pq^3r^6.
8640, 12096, 19008, 22464, 24000, 29160, 29376, 32832, 39744, 40824, 50112, 53568, 56000, 63936, 64152, 65856, 70848, 74304, 75816, 81216, 88000, 91584, 99144, 101952, 104000, 105408, 109760, 110808, 115776, 122688, 126144, 134136, 136000
Offset: 1
Keywords
Links
- T. D. Noe, Table of n, a(n) for n = 1..1000
- Will Nicholes, Prime Signatures
Programs
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Mathematica
f[n_]:=Sort[Last/@FactorInteger[n]]=={1,3,6}; Select[Range[200000],f] -
PARI
list(lim)=my(v=List(),t1,t2);forprime(p=2, (lim\24)^(1/6), t1=p^6;forprime(q=2, (lim\t1)^(1/3), if(p==q, next);t2=t1*q^3;forprime(r=2, lim\t2, if(p==r||q==r, next);listput(v,t2*r)))); vecsort(Vec(v)) \\ Charles R Greathouse IV, Jul 24 2011