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 A004557 #15 Sep 08 2022 08:44:33 %S A004557 2,0,3,3,0,1,2,3,2,3,3,0,3,1,3,0,2,3,3,3,2,2,1,1,0,3,3,2,0,0,2,2,3,3, %T A004557 2,1,3,0,3,2,1,2,0,0,0,3,0,0,0,2,3,2,1,3,1,2,3,2,1,0,0,1,2,2,0,0,2,0, %U A004557 1,0,0,1,0,1,0,3,2,3,1,1,3,3,2,1,3,1,0,1,0,3,2,1,0,2,2,0,3,3,3 %N A004557 Expansion of sqrt(5) in base 4. %H A004557 G. C. Greubel, <a href="/A004557/b004557.txt">Table of n, a(n) for n = 1..10000</a> %H A004557 Jason Kimberley, <a href="/wiki/User:Jason_Kimberley/sqrt_base">Index of expansions of sqrt(d) in base b</a> %t A004557 RealDigits[Sqrt[5],4,120][[1]] (* _Harvey P. Dale_, Mar 28 2012 *) %o A004557 (Magma) d:= 5; m:=4; Prune(Reverse(IntegerToSequence(Isqrt(d*m^100), m))); // _G. C. Greubel_, Mar 31 2018 %K A004557 nonn,base,cons %O A004557 1,1 %A A004557 _N. J. A. Sloane_