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Search: id:A130500
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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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+0
2
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| 1, 1, 2, 3, 3, 4, 4, 5, 5, 4, 5
(list; graph; listen)
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OFFSET
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1,3
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EXAMPLE
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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
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Cf. A130501.
Sequence in context: A061339 A073933 A056792 this_sequence A072073 A061716 A126236
Adjacent sequences: A130497 A130498 A130499 this_sequence A130501 A130502 A130503
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KEYWORD
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more,nonn
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AUTHOR
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Leroy Quet (q1qq2qqq3qqqq(AT)yahoo.com), May 31 2007
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