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 A048317 #8 Oct 13 2019 16:33:35 %S A048317 0,1,2,3,4,5,7,14,21,28,35,42,43,44,45,46,47,84,85,86,87,88,89,126, %T A048317 127,128,129,130,131,168,169,170,171,172,173,210,211,212,213,214,215, %U A048317 258,259,260,261,262,263,516,517,518,519,520,521,774,775,776,777,778,779 %N A048317 Numbers whose base-6 expansions, read from left to right, have run lengths that strictly decrease. %t A048317 Select[Range[0,800],Max[Differences[Length/@Split[IntegerDigits[ #,6]]]]<0&] (* _Harvey P. Dale_, Jul 30 2019 *) %Y A048317 Cf. A037013, A043695, A043709, A044817, A044955. %K A048317 nonn,base %O A048317 0,3 %A A048317 _Patrick De Geest_, Feb 15 1999