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A130500
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a(1)=1. a(n) = number of earlier terms of the sequence which divide (the number of positive integers which are <=n and missing from first (n-1) terms of sequence).
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1
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1, 1, 2, 3, 3, 4, 4, 5, 5, 4, 5, 2, 7, 7, 4, 7, 2, 11, 11, 2, 9, 9, 7, 10, 10, 2, 11, 2, 17, 17, 8, 8, 11, 2, 17, 5, 9, 7, 18, 18, 2, 18, 2, 17, 8, 15, 15, 11, 23, 23, 2, 12, 12, 4, 26, 26, 2, 20, 20, 2, 24, 24, 13, 13, 16, 16, 2, 31, 31, 7, 21, 21, 8, 24, 2, 24, 11, 31, 4, 16, 2, 37, 37, 2, 21
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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EXAMPLE
| The positive integers which are <= 9 and are missing from the first 8 terms of the sequence are 6,7,8,9. The number of these integers is 4, so a(9) is the number of earlier terms which divide 4. Therefore a(9) = 5.
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CROSSREFS
| Cf. A130501.
Sequence in context: A061339 A073933 A056792 * A072073 A061716 A126236
Adjacent sequences: A130497 A130498 A130499 * A130501 A130502 A130503
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KEYWORD
| nonn
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AUTHOR
| Leroy Quet May 31 2007
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EXTENSIONS
| More terms from Sean A. Irvine (sairvin(AT)xtra.co.nz), May 26 2010
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