A190388 Numbers with prime factorization pqrstu^4.

240240, 314160, 351120, 371280, 414960, 425040, 502320, 535920, 542640, 572880, 583440, 633360, 652080, 656880, 677040, 683760, 734160, 757680, 789360, 794640, 808080, 810810, 816816, 828240, 852720, 868560, 885360, 895440, 912912, 925680

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, 1, 1, 1, 1, 4}; Select[Range[1200000], f]

Prog

(PARI) list(lim)=my(v=List(), t1, t2, t3, t4, t5); forprime(p=2, sqrtnint(lim\2310, 4), t1=p^4; forprime(q=2, lim\(210*t1), if(q==p, next); t2=q*t1; forprime(r=2, lim\(30*t2), if(r==p || r==q, next); t3=r*t2; forprime(s=2, lim\(6*t3), if(s==p || s==q || s==r, next); t4=s*t3; forprime(t=2, lim\(2*t4), if(t==p || t==q || t==r || t==s, next); t5=t*t4; forprime(u=2, lim\t5, if(u==p || u==q || u==r || u==s || u==t, next); listput(v, t5*u))))))); Set(v) \\ Charles R Greathouse IV, Aug 25 2016

Crossrefs

Cf. A190386, A190387.

Sequence in context: A234709 A015345 A187960 * A249194 A281887 A127881

Adjacent sequences: A190385 A190386 A190387 * A190389 A190390 A190391

Keyword

nonn

Author

Vladimir Joseph Stephan Orlovsky, May 09 2011

Status

approved