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Search: id:A130685
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| A130685 |
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a(0)=0. a(n) = n-th integer from among those positive integers which are coprime to (a(n-1) + n). |
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+0
1
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| 0, 1, 2, 3, 4, 7, 6, 7, 14, 9, 10, 19, 12, 16, 49, 29, 29, 35, 18, 19, 32, 21, 22, 43, 24, 29, 36, 46, 57, 59, 30, 31, 55, 71, 73, 103, 36, 37, 71, 107, 68, 41, 42, 57, 44, 45, 58, 103, 48, 49, 82, 62, 163, 157, 54, 55, 86, 68, 199, 179, 60
(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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a(13) + 14 = 30. The positive integrs which are coprime to 30 are: 1,7,11,13,17,19,23,29,31,37,41,43,47,49,53,59,61,... The 14th of these integers is 49. So a(14) = 49.
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MAPLE
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a[0]:=0: for n to 60 do CP:={}: for j while nops(CP)<=n do if gcd(n+a[n-1], j) =1 then CP:=`union`(CP, {j}) else end if end do: a[n]:=CP[n] end do: seq(a[n], n=0..60); - Emeric Deutsch (deutsch(AT)duke.poly.edu), Aug 28 2007
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CROSSREFS
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Sequence in context: A132075 A074846 A120225 this_sequence A125595 A091202 A106444
Adjacent sequences: A130682 A130683 A130684 this_sequence A130686 A130687 A130688
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KEYWORD
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nonn
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AUTHOR
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Leroy Quet Aug 12 2007
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EXTENSIONS
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More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Aug 28 2007
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