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

Author

Vladimir Joseph Stephan Orlovsky, May 03 2011

Keywords

• nonn

Links

• T. D. Noe, Table of n, a(n) for n = 1..1000
• Will Nicholes, Prime Signatures
• Index to sequences related to prime signature

Crossrefs

Cf. A179667, A179693.

Programs

Mathematica

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

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