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 A010509 #15 Feb 11 2025 14:42:53
%S A010509 7,4,8,3,3,1,4,7,7,3,5,4,7,8,8,2,7,7,1,1,6,7,4,9,7,4,6,4,6,3,3,0,9,8,
%T A010509 6,0,3,5,1,2,0,3,9,6,1,5,5,5,7,4,5,3,8,9,2,6,0,7,4,9,0,9,3,4,6,4,0,0,
%U A010509 7,0,3,1,2,6,1,3,8,7,8,0,5,5,9,5,3,6,1,9,7,9,0,3,8,8,7,5,9,1,4
%N A010509 Decimal expansion of square root of 56.
%C A010509 Continued fraction expansion is 7 followed by {2, 14} repeated. - _Harry J. Smith_, Jun 06 2009
%H A010509 Harry J. Smith, <a href="/A010509/b010509.txt">Table of n, a(n) for n = 1..20000</a>
%H A010509 <a href="/index/Al#algebraic_02">Index entries for algebraic numbers, degree 2</a>.
%e A010509 7.483314773547882771167497464633098603512039615557453892607490934640070...
%t A010509 RealDigits[N[Sqrt[56],200]][[1]] (* _Vladimir Joseph Stephan Orlovsky_, Feb 25 2011 *)
%o A010509 (PARI) { default(realprecision, 20080); x=sqrt(56); for (n=1, 20000, d=floor(x); x=(x-d)*10; write("b010509.txt", n, " ", d)); } \\ _Harry J. Smith_, Jun 06 2009
%Y A010509 Cf. A040048 Continued fraction. - _Harry J. Smith_, Jun 06 2009
%K A010509 nonn,cons
%O A010509 1,1
%A A010509 _N. J. A. Sloane_