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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
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
Sequence in context: A141709 A330192 A062683 * A137857 A161980 A183533
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.)