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 A363765 Lexicographically earliest sequence of numbers in a hexagonal spiral such that their neighbors have no common digit. 2
 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 44, 11, 20, 13, 22, 14, 23, 15, 24, 16, 25, 17, 26, 33, 27, 30, 28, 34, 55, 29, 40, 35, 60, 57, 46, 37, 18, 39, 47, 19, 36, 45, 70, 12, 48, 51, 49, 31, 50, 21, 38, 41, 53, 61, 42, 58, 32, 80, 52, 64, 59, 62, 81, 56, 43, 72 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS This sequence ends with 672 terms. LINKS Carole Dubois, Table of n, a(n) for n = 1..672 Carole Dubois, Hexagonal spiral for A363765 EXAMPLE a(26) = 27 because the neighbors of the 26th hexagon are 10, 30, 33, 44, 48, 51 who have no common digit with 27. a(673) can't be calculated because its neighbors would be 216, 397 and 548 and they are using all digits. CROSSREFS Cf. A000384, A003458, A014105, A056105. Sequence in context: A141709 A330192 A062683 * A137857 A161980 A183533 Adjacent sequences: A363762 A363763 A363764 * A363766 A363767 A363768 KEYWORD base,nonn,fini,full AUTHOR Carole Dubois, Jun 20 2023 STATUS approved

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Last modified April 15 20:47 EDT 2024. Contains 371696 sequences. (Running on oeis4.)