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 A004540 #17 Sep 08 2022 08:44:33 %S A004540 1,1,0,2,0,1,1,2,2,1,2,2,2,0,0,1,2,1,2,2,1,2,2,2,0,0,1,1,2,1,0,0,0,1, %T A004540 0,2,0,0,0,2,2,0,1,2,1,1,1,2,0,2,0,2,2,0,1,2,0,2,1,1,0,2,2,1,0,1,0,0, %U A004540 0,2,2,1,1,2,1,0,1,1,2,2,1,0,2,0,2,1,2,1,0,0,2,0,2,0,0,2,1,2,0 %N A004540 Expansion of sqrt(2) in base 3. %H A004540 Vincenzo Librandi, <a href="/A004540/b004540.txt">Table of n, a(n) for n = 1..5000</a> %H A004540 Jason Kimberley, <a href="/wiki/User:Jason_Kimberley/sqrt_base">Index of expansions of sqrt(d) in base b</a> %t A004540 RealDigits[Sqrt[2],3,120][[1]] (* _Harvey P. Dale_, Sep 20 2016 *) %o A004540 (Magma) Prune(Reverse(IntegerToSequence(Isqrt(2*3^200), 3))); // _Vincenzo Librandi_, Jan 07 2018 %Y A004540 Cf. A002193, A004539, A004541. %Y A004540 Cf. A004549, A004559, A004575. %K A004540 nonn,base,cons %O A004540 1,4 %A A004540 _N. J. A. Sloane_