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Search: id:A114653
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| 1, 2, 1, 3, 2, 6, 2, 7, 1, 10, 3, 10, 4, 8, 7, 15, 7, 18, 6, 13, 9, 22, 8, 20, 8, 19, 9, 28, 6, 29, 11, 22, 11, 26, 10, 34, 13, 25, 11, 40, 10, 42, 16, 24, 15, 45, 13, 43, 12, 31, 18, 50, 16, 42, 19, 38, 23, 57, 12, 58, 24, 38, 24, 46, 18, 65, 24, 43, 15, 68, 19, 71, 28, 37, 26, 66
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OFFSET
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1,2
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COMMENT
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First occurrence of n: 1, 2, 4, 13, a(5)=??, 6, 8, 14, 21, 10, 31, 49, 20, a(14)=??, 16, 43, a(17)=??, 18, 26, 24, ...,.
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EXAMPLE
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Among the first 5 terms of A114652 (1,2,4,5,8) there are 2 terms (1, 5) which are coprime to 6. So a(6) = 2.
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MATHEMATICA
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a[1] = 1; a[n_] := a[n] = a[n - 1] + Count[GCD[Array[a, n - 1], n], 1]; b = Array[a, 80]; Drop[b, 1] - Drop[b, -1] (* Robert G. Wilson v *)
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CROSSREFS
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Cf. A114652.
Adjacent sequences: A114650 A114651 A114652 this_sequence A114654 A114655 A114656
Sequence in context: A075257 A073711 A071690 this_sequence A069481 A098911 A052305
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KEYWORD
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nonn
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AUTHOR
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Leroy Quet (qq-quet(AT)mindspring.com), Dec 21 2005
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EXTENSIONS
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Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net) and Robert G. Wilson v (rgwv(at)rgwv.com), Dec 23 2005
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