

A046389


Products of exactly three distinct odd primes.


13



105, 165, 195, 231, 255, 273, 285, 345, 357, 385, 399, 429, 435, 455, 465, 483, 555, 561, 595, 609, 615, 627, 645, 651, 663, 665, 705, 715, 741, 759, 777, 795, 805, 861, 885, 897, 903, 915, 935, 957, 969, 987, 1001, 1005, 1015, 1023, 1045, 1065, 1085
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OFFSET

1,1


COMMENTS

The old name was "Odd numbers with exactly 3 distinct prime factors", which is slightly ambiguous, since it might be interpreted to include 315 = 3^2*5*7. Cf. A278569.  N. J. A. Sloane, Nov 27 2016


LINKS

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


MATHEMATICA

f[n_] := OddQ[n] && Last/@FactorInteger[n]=={1, 1, 1}; lst={}; Do[If[f[n], AppendTo[lst, n]], {n, 2000}]; lst (* Vladimir Joseph Stephan Orlovsky, Nov 23 2009 *)


PROG

(PARI) list(lim)=my(v=List(), t); forprime(p=3, lim^(1/3), forprime(q=p+1, sqrt(lim\p), t=p*q; forprime(r=q+1, lim\t, listput(v, t*r)))); vecsort(Vec(v)) \\ Charles R Greathouse IV, Jul 26 2011


CROSSREFS

Cf. A046316, A046405, A007304, A278569.
Sequence in context: A013590 A216918 A278569 * A154430 A118678 A152940
Adjacent sequences: A046386 A046387 A046388 * A046390 A046391 A046392


KEYWORD

nonn


AUTHOR

Patrick De Geest, Jun 15 1998


EXTENSIONS

Name clarified by N. J. A. Sloane, Nov 27 2016


STATUS

approved



