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A155090 Composites n without even prime factor in composite(n). +0
1
4, 8, 12, 15, 21, 26, 30, 33, 35, 38, 40, 44, 46, 49, 55, 58, 63, 66, 68, 70, 77, 81, 84, 86, 88, 90, 92, 94, 100, 102, 106, 108, 110, 112, 116, 118, 121, 123, 126, 129, 131, 134, 136, 140, 142, 144, 146, 150, 154, 156, 158, 160, 162 (list; graph; listen)
OFFSET

1,1

EXAMPLE

If n=4=composite and 3*3=9=composite(4), then 4=a(1). If n=8=composite and 3*5=15=composite(8), then 8=a(2). If n=12=composite and 3*7=21=composite(12), then=a(3), etc.

CROSSREFS

Cf. A002808.

Sequence in context: A099309 A073432 A133803 this_sequence A081747 A020647 A130702

Adjacent sequences: A155087 A155088 A155089 this_sequence A155091 A155092 A155093

KEYWORD

nonn,base

AUTHOR

Juri-Stepan Gerasimov (2stepan(AT0rambler.ru), Jan 20 2009

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Last modified December 20 00:58 EST 2009. Contains 171054 sequences.


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