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 A179691 Numbers p^5*q^2*r where p, q, r are 3 distinct primes. 7
 1440, 2016, 2400, 3168, 3744, 4704, 4860, 4896, 5472, 5600, 6624, 6804, 7840, 8352, 8800, 8928, 10400, 10656, 10692, 11616, 11808, 12150, 12384, 12636, 13536, 13600, 15200, 15264, 16224, 16524, 16992, 17248, 17568, 18400, 18468, 19296, 19360 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS T. D. Noe, Table of n, a(n) for n = 1..1000 Will Nicholes, Prime Signatures MAPLE op(select(n->nops(factorset(n))=3 and sort([seq(op(2, a), a=ifactors(n)[2])])=[1, 2, 5], [\$1..19360])); # Paolo P. Lava, Jul 17 2019 MATHEMATICA f[n_]:=Sort[Last/@FactorInteger[n]]=={1, 2, 5}; Select[Range[20000], f] PROG (PARI) list(lim)=my(v=List(), t1, t2); forprime(p=2, (lim\12)^(1/5), t1=p^5; forprime(q=2, sqrt(lim\t1), if(p==q, next); t2=t1*q^2; forprime(r=2, lim\t2, if(p==r||q==r, next); listput(v, t2*r)))); vecsort(Vec(v)) \\ Charles R Greathouse IV, Jul 24 2011 CROSSREFS Part of the list A178739 .. A179696 (and A030514 .. A030629, A189982 .. A189990 etc, cf. A101296). - M. F. Hasler, Jul 17 2019 Subsequence of A175746 (numbers with 36 divisors). Sequence in context: A174277 A063846 A252186 * A078095 A157508 A061221 Adjacent sequences:  A179688 A179689 A179690 * A179692 A179693 A179694 KEYWORD nonn AUTHOR Vladimir Joseph Stephan Orlovsky, Jul 24 2010 EXTENSIONS Name improved by M. F. Hasler, Jul 17 2019 STATUS approved

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Last modified October 14 12:31 EDT 2019. Contains 328006 sequences. (Running on oeis4.)