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A176655 Numbers that are divisible by exactly 7 different primes 3
510510, 570570, 690690, 746130, 870870, 881790, 903210, 930930, 1009470, 1021020, 1067430, 1111110, 1138830, 1141140, 1193010, 1217370, 1231230, 1272810, 1291290, 1345890, 1360590, 1381380, 1385670, 1411410, 1438710 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..25.

EXAMPLE

1711710 = 2 * 3^2 * 5 * 7 * 11 * 13 * 19

MATHEMATICA

Select[Range[9!, 5*9! ], Length[FactorInteger[ # ]]==7&]

PROG

(PARI) isA176655(n)=omega(n)==7 \\ Charles R Greathouse IV, Mar 11, 2011

CROSSREFS

Cf. A007774, A033992, A033993, A046386, A046387, A067885, A074969, A123321.

Sequence in context: A273987 A250057 A230619 * A123321 A258362 A147574

Adjacent sequences:  A176652 A176653 A176654 * A176656 A176657 A176658

KEYWORD

nonn

AUTHOR

Vladimir Joseph Stephan Orlovsky, Apr 22 2010

STATUS

approved

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Last modified October 16 15:51 EDT 2019. Contains 328101 sequences. (Running on oeis4.)