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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, 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
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.)