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

1,1

Links

T. D. Noe, Table of n, a(n) for n = 1..1000

Will Nicholes, Prime Signatures

Mathematica

f[n_]:=Sort[Last/@FactorInteger[n]]=={1, 3, 6}; Select[Range[200000], f]

Prog

(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

Crossrefs

Cf. A179747, A190465, A190466.

Sequence in context: A031809 A252471 A250589 * A057658 A075006 A361796

Adjacent sequences: A190464 A190465 A190466 * A190468 A190469 A190470

Keyword

nonn

Author

Vladimir Joseph Stephan Orlovsky, May 10 2011

Status

approved