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Search: id:A128267
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| A128267 |
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a(0) = 1; a(n) = GCD((number of earlier terms which are coprime to n),(sum of the earlier terms which are coprime to n)). |
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+0
2
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| 1, 1, 2, 1, 3, 1, 4, 1, 2, 1, 1, 1, 8
(list; graph; listen)
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OFFSET
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0,3
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LINKS
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Leroy Quet, Home Page (listed in lieu of email address)
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EXAMPLE
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The terms among {a(0),a(1),...a(7)} that are coprime to 8 are a(0)=1, a(1)=1, a(3)=1, a(4)=3, a(5)=1 and a(7)=1. There are 6 such terms and the sum of these terms is 8. So a(8) = GCD(6,8) = 2.
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CROSSREFS
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Cf. A128268.
Sequence in context: A142593 A102547 A087267 this_sequence A028920 A055396 A057499
Adjacent sequences: A128264 A128265 A128266 this_sequence A128268 A128269 A128270
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KEYWORD
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more,nonn
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AUTHOR
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Leroy Quet Feb 22 2007
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