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 A010493 #14 Aug 21 2023 12:24:29
%S A010493 6,2,4,4,9,9,7,9,9,8,3,9,8,3,9,8,2,0,5,8,4,6,8,9,3,1,2,0,9,3,9,7,9,4,
%T A010493 4,6,1,0,7,2,9,5,9,9,7,7,9,9,1,6,5,6,3,0,8,4,5,2,9,7,1,9,3,0,6,0,9,6,
%U A010493 1,1,2,0,0,5,8,3,5,1,4,5,0,0,6,3,3,3,3,6,1,1,2,2,2,1,3,4,0,5,8
%N A010493 Decimal expansion of square root of 39.
%C A010493 Continued fraction expansion is 6 followed by {4, 12} repeated. - _Harry J. Smith_, Jun 05 2009
%H A010493 Harry J. Smith, <a href="/A010493/b010493.txt">Table of n, a(n) for n = 1..20000</a>
%H A010493 <a href="/index/Al#algebraic_02">Index entries for algebraic numbers, degree 2</a>
%e A010493 6.244997998398398205846893120939794461072959977991656308452971930609611....
%t A010493 RealDigits[N[Sqrt[39],200]][[1]] (* _Vladimir Joseph Stephan Orlovsky_, Feb 24 2011 *)
%o A010493 (PARI) default(realprecision, 20080); x=sqrt(39); for (n=1, 20000, d=floor(x); x=(x-d)*10; write("b010493.txt", n, " ", d)); \\ _Harry J. Smith_, Jun 05 2009
%Y A010493 Cf. A040032 (continued fraction).
%K A010493 nonn,cons
%O A010493 1,1
%A A010493 _N. J. A. Sloane_