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 A226637 #12 Feb 07 2025 10:36:30 %S A226637 0,1,2,3,4,5,6,7,8,9,19,29,39,49,59,69,79,99,199,299,399,499,599,699, %T A226637 799,999,1999,2999,3999,4999,5999,6999,7999,9999,19999,29999,39999, %U A226637 49999,59999,69999,79999,99999,199999,299999,399999 %N A226637 Numbers m having with m+1 no common digit in decimal representations. %F A226637 A076489(a(n)) = 0; %F A226637 A000030(a(n)) <> 8 for n > 9. %o A226637 (Haskell) %o A226637 a226637 n = a226637_list !! (n-1) %o A226637 a226637_list = filter ((== 0) . a076489) [0..] %o A226637 (PARI) isok(k) = #setintersect(Set(digits(k)), Set(digits(k+1))) == 0; \\ _Michel Marcus_, Feb 07 2025 %Y A226637 Cf. A000030, A076489. %K A226637 nonn,base %O A226637 1,3 %A A226637 _Reinhard Zumkeller_, Sep 01 2013