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Search: id:A140887
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| 1, 1, 1, 2, 3, 2, 3, 2, 3, 3, 4, 2, 3, 4, 2, 3, 3, 6, 3, 3, 3, 2, 4, 4, 4, 3, 5, 2, 4, 4, 4, 4, 4, 3, 3, 4, 2, 5, 5, 4, 3, 4, 4, 2, 6, 5
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OFFSET
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1,4
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EXAMPLE
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If n=1 and (1 is composite, 7, 11, 13, 17, 19, 23, 29) then a(1)=1
If n=4 and (91 is composite, 97, 101, 103, 107, 109, 113, 119 is composite) then a(4)=2
If n=21 and (601, 607, 607, 611 is composite, 613, 617, 619, 623 is composite, 629 is composite) then a(21)=3.
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CROSSREFS
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Cf. A007775.
Sequence in context: A086411 A105528 A076225 this_sequence A132423 A071995 A114108
Adjacent sequences: A140884 A140885 A140886 this_sequence A140888 A140889 A140890
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KEYWORD
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nonn
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AUTHOR
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Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Jul 06 2008
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