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Search: id:A069280
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| A069280 |
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19-almost primes (generalization of semiprimes). |
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+0
8
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| 524288, 786432, 1179648, 1310720, 1769472, 1835008, 1966080, 2654208, 2752512, 2883584, 2949120, 3276800, 3407872, 3981312, 4128768, 4325376, 4423680, 4456448, 4587520, 4915200, 4980736, 5111808, 5971968, 6029312, 6193152
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Divisible by exactly 19 primes (counted with multiplicity).
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LINKS
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D. W. Wilson, Table of n, a(n) for n = 1..10000
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
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FORMULA
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Product p_i^e_i with Sum e_i = 19.
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PROGRAM
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(PARI) k=19; start=2^k; finish=8000000; v=[] for(n=start, finish, if(bigomega(n)==k, v=concat(v, n))); v
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CROSSREFS
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Cf. A001358 (semiprimes), A069279 (18-almost primes), A069281 (20-almost primes).
Sequence in context: A011569 A022535 A069394 this_sequence A017702 A010807 A017701
Adjacent sequences: A069277 A069278 A069279 this_sequence A069281 A069282 A069283
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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), Mar 13 2002
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