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A073870
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Smallest composite number not included earlier that is a multiple of n.
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2
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4, 6, 9, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 15, 32, 34, 36, 38, 40, 21, 44, 46, 48, 25, 52, 27, 56, 58, 30, 62, 64, 33, 68, 35, 72, 74, 76, 39, 80, 82, 42, 86, 88, 45, 92, 94, 96, 49, 50, 51, 104, 106, 54, 55, 112, 57, 116, 118, 60, 122, 124, 63, 128, 65, 66, 134, 136
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| A permutation of the composite numbers.
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FORMULA
| It appears that for n>3, if n is an odd composite number then a(n) = n, otherwise a(n) = 2n.
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CROSSREFS
| Cf. A073871.
Sequence in context: A180853 A033186 A085088 * A084335 A197575 A201660
Adjacent sequences: A073867 A073868 A073869 * A073871 A073872 A073873
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KEYWORD
| nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Aug 16 2002
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EXTENSIONS
| Corrected and extended by Frank Adams-Watters (FrankTAW(AT)Netscape.net), May 12 2006
Edited by N. J. A. Sloane (njas(AT)research.att.com), May 05 2007
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