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Search: id:A130499
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| A130499 |
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a(1)=1. a(n) = number of earlier terms of the sequence which are coprime to (the sum 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, 3, 5, 6, 6, 6, 10
(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 4,7,8,9. The sum of these integers is 28, so a(9) is the number of earlier terms which are coprime to 28. Therefore a(9) = 6.
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CROSSREFS
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Cf. A130498.
Sequence in context: A087418 A087731 A014202 this_sequence A020910 A029065 A060210
Adjacent sequences: A130496 A130497 A130498 this_sequence A130500 A130501 A130502
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KEYWORD
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more,nonn
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AUTHOR
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Leroy Quet (qq-quet(AT)mindspring.com), May 31 2007
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