This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A363765 #41 May 31 2024 22:06:46 %S A363765 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, %T A363765 30,28,34,55,29,40,35,60,57,46,37,18,39,47,19,36,45,70,12,48,51,49,31, %U A363765 50,21,38,41,53,61,42,58,32,80,52,64,59,62,81,56,43,72 %N A363765 Lexicographically earliest sequence of numbers in a hexagonal spiral such that their neighbors have no common digit. %C A363765 This sequence ends with 672 terms. %H A363765 Carole Dubois, <a href="/A363765/b363765.txt">Table of n, a(n) for n = 1..672</a> %H A363765 Carole Dubois, <a href="/A363765/a363765_1.jpg">Hexagonal spiral for A363765</a> %e A363765 a(26) = 27 because the neighbors of the 26th hexagon are 10, 30, 33, 44, 48, 51 which have no common digit with 27. %e A363765 a(673) can't be calculated because its neighbors would be 216, 397, and 548, and they use all digits. %Y A363765 Cf. A000384, A003458, A014105, A056105. %K A363765 base,nonn,fini,full %O A363765 1,3 %A A363765 _Carole Dubois_, Jun 20 2023