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A130603
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a(0)=0. a(n) = the n-th positive integer which is coprime to (a(n-1)+1).
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0
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0, 1, 3, 5, 11, 13, 13, 15, 15, 17, 29, 41, 41, 43, 29, 53, 47, 49, 43, 41, 67, 43, 47, 67, 49, 61, 53, 79, 69, 83, 103, 67, 67, 69, 99, 87, 79, 91, 79, 97, 93, 83, 145, 87, 95, 133, 93, 95, 143, 145, 101, 161, 155, 173, 167, 191, 167, 197, 191, 175, 131, 199, 153, 159, 159
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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EXAMPLE
| a(8) + 1 = 15 + 1 = 16. The positive integers which are coprime to 16 form the sequence: 1,3,5,7,9,11,13,15,17,19,21,23,... The 9th of these is 17. So a(9) = 17.
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MATHEMATICA
| a = {0}; For[n = 1, n < 60, n++, i = 0; b = 0; While[i < n, b++; If[GCD[a[[ -1]] + 1, b] == 1, i++ ]]; AppendTo[a, b]]; a - Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Oct 16 2007
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CROSSREFS
| Cf. A123302.
Sequence in context: A072063 A115398 A014597 * A069977 A065396 A020620
Adjacent sequences: A130600 A130601 A130602 * A130604 A130605 A130606
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KEYWORD
| nonn
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AUTHOR
| Leroy Quet Aug 10 2007
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EXTENSIONS
| More terms from Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Oct 16 2007
More terms from Sean A. Irvine (sairvin(AT)xtra.co.nz), Mar 03 2010
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