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Search: id:A130498
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| A130498 |
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a(1)=1. a(n) = number of earlier terms of the sequence which are coprime to (the number of positive integers which are <=n and missing from first (n-1) terms of sequence). |
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2
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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 3,7,8,9. There are 4 such integers, so a(9) is the number of earlier terms which are coprime to 4. Therefore a(9) = 3.
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CROSSREFS
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Cf. A130499.
Adjacent sequences: A130495 A130496 A130497 this_sequence A130499 A130500 A130501
Sequence in context: A137413 A010848 A133937 this_sequence A064574 A059015 A024683
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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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