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 A004571 #13 Sep 08 2022 08:44:33 %S A004571 2,2,2,1,1,1,0,3,3,3,3,1,1,0,3,2,2,1,1,3,3,0,1,3,1,0,3,1,2,3,3,0,1,3, %T A004571 0,3,2,2,2,1,3,3,2,1,2,0,1,3,3,3,0,0,3,1,3,2,2,0,2,0,0,3,1,1,1,1,0,2, %U A004571 2,1,3,1,3,3,3,3,2,1,3,2,3,1,3,2,0,1,0,0,1,1,1,3,1,3,3,3,0,2,0 %N A004571 Expansion of sqrt(7) in base 4. %H A004571 G. C. Greubel, <a href="/A004571/b004571.txt">Table of n, a(n) for n = 1..10000</a> %H A004571 Jason Kimberley, <a href="/wiki/User:Jason_Kimberley/sqrt_base">Index of expansions of sqrt(d) in base b</a> %t A004571 RealDigits[Sqrt[7], 4, 100][[1]] (* _G. C. Greubel_, Mar 25 2018 *) %o A004571 (Magma) d:= 7; m:=4; Prune(Reverse(IntegerToSequence(Isqrt(d*m^100), m))); // _G. C. Greubel_, Mar 25 2018 %Y A004571 Cf. A010465. %K A004571 nonn,base,cons %O A004571 1,1 %A A004571 _N. J. A. Sloane_