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Search: id:A123666
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A123666 Numbers with an even number of prime factors, at least half of which are 2. +0
2
1, 4, 6, 10, 14, 16, 22, 24, 26, 34, 36, 38, 40, 46, 56, 58, 60, 62, 64, 74, 82, 84, 86, 88, 94, 96, 100, 104, 106, 118, 122, 132, 134, 136, 140, 142, 144, 146, 152, 156, 158, 160, 166, 178, 184, 194, 196, 202, 204, 206, 214, 216, 218, 220, 224, 226, 228, 232, 240 (list; graph; listen)
OFFSET

1,2

COMMENT

This is the lexicographically first maximal set of nonprime integers that has unique factorization. Products of any number of terms from A100484, with repetition allowed.

CROSSREFS

Cf. A100484, A002808, A123667.

Sequence in context: A110507 A134624 A063745 this_sequence A095305 A058917 A137860

Adjacent sequences: A123663 A123664 A123665 this_sequence A123667 A123668 A123669

KEYWORD

nonn

AUTHOR

Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), Oct 04 2006

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.


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