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 A004556 #12 Sep 08 2022 08:44:33 %S A004556 2,0,2,0,1,0,1,0,0,2,1,1,2,0,1,2,1,1,0,0,2,1,1,2,0,0,2,1,1,0,0,2,1,1, %T A004556 1,0,0,2,1,2,1,2,0,1,0,1,2,1,2,2,2,0,2,2,0,0,2,1,0,2,2,0,0,1,0,1,1,2, %U A004556 0,0,1,1,2,0,0,1,0,1,1,2,0,0,0,2,2,1,1,2,1,0,1,1,1,1,2,2,1,2,1 %N A004556 Expansion of sqrt(5) in base 3. %H A004556 G. C. Greubel, <a href="/A004556/b004556.txt">Table of n, a(n) for n = 1..10000</a> %H A004556 Jason Kimberley, <a href="/wiki/User:Jason_Kimberley/sqrt_base">Index of expansions of sqrt(d) in base b</a> %t A004556 RealDigits[Sqrt[5], 3, 100][[1]] (* _G. C. Greubel_, Mar 31 2018 *) %o A004556 (Magma) d:= 5; m:=3; Prune(Reverse(IntegerToSequence(Isqrt(d*m^100), m))); // _G. C. Greubel_, Mar 31 2018 %K A004556 nonn,base,cons %O A004556 1,1 %A A004556 _N. J. A. Sloane_