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Search: id:A123322
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| A123322 |
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Products of 8 distinct primes (square-free 8-almost primes). |
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+0
2
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| 9699690, 11741730, 13123110, 14804790, 15825810, 16546530, 17160990, 17687670, 18888870, 20030010, 20281170, 20930910, 21111090, 21411390, 21637770, 21951930, 23130030, 23393370, 23993970, 24534510, 25555530, 25571910
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Intersection of A005117 and A046310.
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LINKS
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Rick Shephard, Table of n, a(n) for n = 1..10000
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EXAMPLE
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a(1) = 9699690 = 2*3*5*7*11*13*17*19 = A002110(8).
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MATHEMATICA
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f8Q[n_]:=Last/@FactorInteger[n]=={1, 1, 1, 1, 1, 1, 1, 1}; lst={}; Do[If[f8Q[n], AppendTo[lst, n]], {n, 10!, 11!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Aug 26 2008]
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CROSSREFS
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Cf. A005117, A046310, A048692, Square-free k-almost primes: A000040 (k=1), A006881 (k=2), A007304 (k=3), A046386 (k=4), A046387 (k=5), A067885 (k=6), A123321 (k=7), A115343 (k=9).
Adjacent sequences: A123319 A123320 A123321 this_sequence A123323 A123324 A123325
Sequence in context: A124515 A075009 A103936 this_sequence A046326 A058332 A058328
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KEYWORD
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nonn
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AUTHOR
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Rick L. Shepherd (rshepherd2(AT)hotmail.com), Sep 25 2006
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