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 A004609 #15 Oct 14 2018 00:16:09 %S A004609 1,0,0,1,1,1,0,0,1,1,0,0,0,1,0,0,0,1,1,1,0,0,0,0,1,0,1,0,0,0,0,0,0,1, %T A004609 0,0,1,0,0,1,0,0,0,0,1,0,0,1,0,1,1,1,0,0,1,1,1,1,1,0,1,0,0,0,0,0,0,1, %U A004609 1,0,0,1,0,0,0,0,1,1,0,0,1,0,0,0,1,0,1,0,0,0,0,1,1,0,0,1,0,0,0 %N A004609 Expansion of sqrt(6) in base 2. %H A004609 Ivan Panchenko, <a href="/A004609/b004609.txt">Table of n, a(n) for n = 2..1000</a> %H A004609 Jason Kimberley, <a href="/wiki/User:Jason_Kimberley/sqrt_base">Index of expansions of sqrt(d) in base b</a> %t A004609 RealDigits[Sqrt[6], 2, 110][[1]] (* _G. C. Greubel_, Oct 13 2018 *) %K A004609 nonn,base,cons %O A004609 2,1 %A A004609 _N. J. A. Sloane_