A190468 Numbers with prime factorization pq^4r^5.

12960, 18144, 19440, 27216, 28512, 33696, 42768, 44064, 49248, 50544, 59616, 60000, 66096, 73872, 75168, 80352, 89424, 95904, 106272, 111456, 112752, 120528, 121824, 137376, 140000, 143856, 150000, 152928, 158112, 159408, 167184, 173664

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, 4, 5}; Select[Range[300000], f]

Prog

(PARI) list(lim)=my(v=List(), t1, t2); forprime(p=2, (lim\48)^(1/5), t1=p^5; forprime(q=2, (lim\t1)^(1/4), if(p==q, next); t2=t1*q^4; forprime(r=2, lim\t2, if(p==r||q==r, next); listput(v, t2*r)))); vecsort(Vec(v)) \\ Charles R Greathouse IV, Jul 20 2011

Crossrefs

Cf. A190466, A190467.

Sequence in context: A090887 A246890 A145333 * A028385 A335742 A238142

Adjacent sequences: A190465 A190466 A190467 * A190469 A190470 A190471

Keyword

nonn

Author

Vladimir Joseph Stephan Orlovsky, May 10 2011

Status

approved