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Search: id:A069278
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| A069278 |
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17-almost primes (generalization of semiprimes). |
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+0
8
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| 131072, 196608, 294912, 327680, 442368, 458752, 491520, 663552, 688128, 720896, 737280, 819200, 851968, 995328, 1032192, 1081344, 1105920, 1114112, 1146880, 1228800, 1245184, 1277952, 1492992, 1507328, 1548288, 1605632, 1622016
(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 17 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 = 17.
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PROGRAM
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(PARI) k=17; start=2^k; finish=2000000; 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), A069277 (16-almost primes), A069279 (18-almost primes) - A069281 (20-almost primes).
Sequence in context: A075968 A022533 A069392 this_sequence A017698 A010805 A138032
Adjacent sequences: A069275 A069276 A069277 this_sequence A069279 A069280 A069281
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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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