A190390 Numbers with prime factorization pqrst^2u^3.

360360, 471240, 526680, 540540, 556920, 600600, 622440, 637560, 706860, 753480, 785400, 790020, 803880, 813960, 835380, 840840, 859320, 875160, 877800, 928200, 933660, 950040, 956340, 978120, 985320, 1015560, 1025640, 1037400, 1062600

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, 2, 3}; Select[Range[1500000], f]

Prog

(PARI) list(lim)=my(v=List(), t1, t2, t3, t4, t5); forprime(p=2, sqrtnint(lim\4620, 3), t1=p^3; forprime(q=2, sqrtint(lim\(210*t1)), if(q==p, next); t2=q^2*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. A190387, A190388.

Sequence in context: A251456 A254566 A151619 * A357700 A034630 A251298

Adjacent sequences: A190387 A190388 A190389 * A190391 A190392 A190393

Keyword

nonn

Author

Vladimir Joseph Stephan Orlovsky, May 09 2011

Status

approved