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 A037971 #13 Apr 13 2021 23:15:05 %S A037971 15,16,30,33,47,48,60,61,66,67,79,80,94,97,111,112,120,121,122,123, %T A037971 132,133,134,135,143,144,158,161,175,176,188,189,194,195,207,208,222, %U A037971 225,239,240,241,242,243,244,245,246,247,264,265 %N A037971 Numbers whose maximal base-2 run length is 4. %H A037971 Harvey P. Dale, <a href="/A037971/b037971.txt">Table of n, a(n) for n = 1..1000</a> %t A037971 Select[Range[300],Max[Length/@Split[IntegerDigits[#,2]]]==4&] (* _Harvey P. Dale_, Apr 24 2019 *) %Y A037971 Cf. A043276. %K A037971 nonn,base %O A037971 1,1 %A A037971 _Clark Kimberling_