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 A004570 #16 Sep 08 2022 08:44:33 %S A004570 2,1,2,2,1,0,2,2,0,2,0,2,2,2,0,1,1,1,1,2,0,1,0,0,0,2,2,2,0,1,2,1,0,1, %T A004570 2,0,1,2,1,2,2,0,0,0,0,0,0,2,0,1,1,1,2,1,1,0,1,0,1,2,0,2,2,1,2,2,0,2, %U A004570 0,0,0,2,0,1,1,1,0,0,2,1,2,1,1,1,1,1,1,2,1,0,1,2,2,2,2,1,2,2,1 %N A004570 Expansion of sqrt(7) in base 3. %H A004570 G. C. Greubel, <a href="/A004570/b004570.txt">Table of n, a(n) for n = 1..10000</a> %H A004570 Jason Kimberley, <a href="/wiki/User:Jason_Kimberley/sqrt_base">Index of expansions of sqrt(d) in base b</a> %t A004570 RealDigits[Sqrt[7],3,120][[1]] (* _Harvey P. Dale_, May 02 2012 *) %o A004570 (Magma) d:= 7; m:=3; Prune(Reverse(IntegerToSequence(Isqrt(d*m^100), m))); // _G. C. Greubel_, Mar 25 2018 %Y A004570 Cf. A010465. %K A004570 nonn,base,cons %O A004570 1,1 %A A004570 _N. J. A. Sloane_