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Search: id:A118000
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| A118000 |
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a(0) = 0. a(n) = a(n-1) + (smallest integer >= n which is coprime to a(n-1)). |
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3
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| 0, 1, 3, 7, 11, 16, 23, 30, 41, 50, 61, 72, 85, 98, 113, 128, 145, 162, 181, 200, 221, 242, 265, 288, 313, 338, 365, 392, 421, 450, 481, 512, 545, 578, 613, 648, 685, 722, 761, 800, 841, 882, 925, 968, 1013, 1058, 1105, 1152, 1201, 1250, 1301, 1352, 1405, 1458
(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) = 30. 8, 9, and 10 are each not coprime to 30. The smallest integer >= 8 which is coprime to 30 is 11, and so a(8) = a(7) + 11 = 41.
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MAPLE
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A118000 := 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: A118000(100) ; - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jun 06 2007
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CROSSREFS
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Cf. A118001, A118002.
Sequence in context: A082644 A131024 A053982 this_sequence A121640 A112786 A023211
Adjacent sequences: A117997 A117998 A117999 this_sequence A118001 A118002 A118003
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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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