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A163578
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If n is prime, a(n) is next composite greater than a(n-1), else if n is composite, a(n) is next prime greater than a(n-1) else 2.
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1
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2, 4, 6, 7, 8, 11, 12, 13, 17, 19, 20, 23, 24, 29, 31, 37, 38, 41, 42, 43
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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Table of n, a(n) for n=1..20.
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EXAMPLE
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1 is not prime, a(1)=2, 2 is prime, a(2)=4, 3 is prime, a(3)=6, 4 is composite, a(4)=7.
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CROSSREFS
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Cf. A159559
Sequence in context: A165778 A286066 A139527 * A269389 A092054 A334573
Adjacent sequences: A163575 A163576 A163577 * A163579 A163580 A163581
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KEYWORD
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nonn
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AUTHOR
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Gerald Hillier, Jul 31 2009
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STATUS
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approved
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