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Search: id:A118002
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| A118002 |
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a(0) = 0. a(n) = a(n-1) + (largest integer <= n which is coprime to a(n-1)). |
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3
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| 0, 1, 3, 5, 9, 14, 19, 26, 33, 41, 51, 62, 73, 86, 99, 113, 129, 146, 163, 182, 201, 221, 243, 266, 289, 314, 339, 365, 393, 422, 451, 482, 513, 545, 579, 614, 649, 686, 723, 761, 801, 842, 883, 926, 969, 1013, 1059, 1106, 1153, 1202, 1251, 1301, 1353, 1406
(list; graph; listen)
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OFFSET
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0,3
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EXAMPLE
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a(7) = 26. 8 is not coprime to 26. The smallest integer <= 8 which is coprime to 26 is 7, and so a(8) = a(7) + 7 = 33.
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MAPLE
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A118002 := proc(nmax) local a, n ; a := [0] ; while nops(a) < nmax do n := nops(a) ; while gcd(n, op(-1, a)) <> 1 do n := n-1 ; od ; a := [op(a), op(-1, a)+n] ; od ; RETURN(a) ; end: A118002(100) ; - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jun 06 2007
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CROSSREFS
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Cf. A118000, A118003.
Sequence in context: A134672 A082874 A127720 this_sequence A069533 A054066 A081946
Adjacent sequences: A117999 A118000 A118001 this_sequence A118003 A118004 A118005
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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), Apr 09 2006
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jun 06 2007
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