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 A068804 #9 Sep 19 2024 21:41:37 %S A068804 0,1,3,6,10,21,45,78,120,190,210,231,435,465,9180,9870,12403,24310, %T A068804 24531,47586,109278,231540,235641,246753,327645,541320,542361,921403, %U A068804 1053426,1345620,1360425,1390278,1405326,1624503,1679028,2098176,2465310,2467531,3049215,3078921 %N A068804 Triangular numbers whose digits can be rearranged to form a substring of 123456789012345678901234.... %H A068804 Andrew Howroyd, <a href="/A068804/b068804.txt">Table of n, a(n) for n = 1..10000</a> %e A068804 9180 is a term whose digits can be arranged as 8901. %e A068804 47586 is a term as its digits can be arranged as 45678. %Y A068804 Intersection of A000217 and A376300. %Y A068804 Cf. A068708. %K A068804 base,nonn %O A068804 1,3 %A A068804 _Amarnath Murthy_, Mar 06 2002 %E A068804 More terms from Christopher Lund (clund(AT)san.rr.com), Apr 14 2002 %E A068804 Offset changed and a(32) onwards from _Andrew Howroyd_, Sep 19 2024