A189984 Numbers with prime factorization pqrst^3.

9240, 10920, 14280, 15960, 17160, 19320, 20790, 22440, 24024, 24360, 24570, 25080, 26040, 26520, 29640, 30360, 31080, 31416, 32130, 34440, 35112, 35880, 35910, 36120, 37128, 38280, 38610, 38760, 39480, 40040, 40920, 41496, 42504, 43470

Offset

1,1

Links

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

Will Nicholes, Prime Signatures

Index to sequences related to prime signature

Mathematica

f[n_]:=Sort[Last/@FactorInteger[n]]=={1, 1, 1, 1, 3}; Select[Range[80000], f]

Prog

(PARI) list(lim)=my(v=List(), t1, t2, t3, t4); forprime(p=2, sqrtnint(lim\210, 3), t1=p^3; forprime(q=2, lim\(30*t1), if(q==p, next); t2=q*t1; forprime(r=2, lim\(6*t2), if(r==p || r==q, next); t3=r*t2; forprime(s=2, lim\(2*t3), if(s==p || s==q || s==r, next); t4=s*t3; forprime(t=2, lim\t4, if(t==p || t==q || t==r || t==s, next); listput(v, t4*t)))))); Set(v) \\ Charles R Greathouse IV, Aug 25 2016

Crossrefs

Cf. A179667, A179693.

Sequence in context: A031594 A262508 A272596 * A092005 A236512 A031848

Adjacent sequences: A189981 A189982 A189983 * A189985 A189986 A189987

Keyword

nonn

Author

Vladimir Joseph Stephan Orlovsky, May 03 2011

Status

approved