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 A123302 a(0) = 1. a(n) = the n-th integer from among those positive integers coprime to a(n-1). 1
 1, 1, 2, 5, 4, 9, 8, 13, 8, 17, 10, 27, 17, 13, 15, 28, 37, 17, 19, 20, 49, 24, 65, 31, 24, 73, 26, 57, 44, 63, 52, 67, 32, 65, 46, 73, 36, 109, 38, 81, 59, 41, 43, 44, 95, 59, 46, 97, 48, 145, 64, 101, 52, 113, 54, 163, 56, 131, 58, 121, 65, 82, 127, 63, 110, 177, 100, 167, 68 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS EXAMPLE The positive integers coprime to a(6)=8 are 1,3,5,7,9,11,13,15,17,19... The seventh of these is 13, so a(7) = 13. MATHEMATICA f[l_List] := Block[{k = 0, c = Length[l]}, While[c > 0, k++; While[ GCD[k, l[[ -1]]] > 1, k++ ]; c--; ]; Append[l, k]]; Nest[f, {1}, 70] (*Chandler*) CROSSREFS Sequence in context: A065221 A114752 A204923 * A120119 A048678 A084432 Adjacent sequences:  A123299 A123300 A123301 * A123303 A123304 A123305 KEYWORD nonn AUTHOR Leroy Quet Nov 08 2006 EXTENSIONS Extended by Ray Chandler, Nov 11 2006 STATUS approved

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