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 A037981 #8 Mar 29 2025 15:28:54 %S A037981 6,12,18,24,25,30,32,33,34,37,43,49,50,56,60,61,63,64,68,74,75,81,87, %T A037981 90,91,92,94,99,100,106,112,118,120,121,122,123,126,127,128,129,131, %U A037981 137,143,149,150,151,152,153,154,160,161,162,163 %N A037981 Maximal base 5 run length is 2. %t A037981 Select[Range[170],Max[Length/@Split[IntegerDigits[#,5]]]==2&] (* _Harvey P. Dale_, Mar 29 2025 *) %Y A037981 Cf. A043279. %K A037981 nonn,base %O A037981 1,1 %A A037981 _Clark Kimberling_