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 A330623 Lexicographically earliest sequence of positive terms such that for any n > 0 and k > 0, a(n+2*k) <> gcd(a(n), a(n+k)). 3
 1, 1, 2, 2, 3, 2, 2, 3, 3, 4, 4, 2, 4, 3, 3, 5, 3, 3, 4, 4, 5, 4, 4, 2, 5, 6, 2, 5, 6, 3, 6, 4, 3, 6, 6, 5, 4, 4, 3, 4, 5, 5, 6, 7, 5, 4, 4, 6, 4, 4, 7, 5, 5, 6, 5, 6, 7, 8, 4, 5, 7, 7, 6, 7, 8, 6, 3, 6, 7, 8, 5, 5, 8, 3, 6, 9, 5, 8, 7, 5, 9, 7, 7, 8, 6, 5, 8 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS This sequence differs radically from the variant where we consider nonnegative terms (A330622). LINKS Rémy Sigrist, Table of n, a(n) for n = 1..10000 Rémy Sigrist, Scatterplot of the first 250000 terms Rémy Sigrist, C program for A330623 PROG (C) See Links section. CROSSREFS Cf. A330622 (nonnegative variant). See A330267 for similar sequences. Sequence in context: A187182 A362816 A176208 * A153095 A254574 A306991 Adjacent sequences: A330620 A330621 A330622 * A330624 A330625 A330626 KEYWORD nonn AUTHOR Rémy Sigrist, Dec 21 2019 STATUS approved

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Last modified February 28 19:33 EST 2024. Contains 370400 sequences. (Running on oeis4.)