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 A010521 #15 Feb 11 2025 14:44:51
%S A010521 8,3,0,6,6,2,3,8,6,2,9,1,8,0,7,4,8,5,2,5,8,4,2,6,2,7,4,4,9,0,7,4,9,2,
%T A010521 0,1,0,2,3,2,2,1,4,2,4,8,9,5,5,6,5,5,7,7,9,4,3,2,1,8,8,3,6,9,0,3,7,5,
%U A010521 8,5,0,3,3,4,2,3,1,5,1,5,7,3,8,6,7,3,9,8,5,0,8,2,3,2,3,5,7,0,5
%N A010521 Decimal expansion of square root of 69.
%C A010521 Continued fraction expansion is 8 followed by {3, 3, 1, 4, 1, 3, 3, 16} repeated. - _Harry J. Smith_, Jun 08 2009
%H A010521 Harry J. Smith, <a href="/A010521/b010521.txt">Table of n, a(n) for n = 1..20000</a>
%H A010521 <a href="/index/Al#algebraic_02">Index entries for algebraic numbers, degree 2</a>.
%e A010521 8.306623862918074852584262744907492010232214248955655779432188369037585...
%t A010521 RealDigits[N[69^(1/2),200]][[1]] (* _Vladimir Joseph Stephan Orlovsky_, Jan 22 2012 *)
%o A010521 (PARI) { default(realprecision, 20080); x=sqrt(69); for (n=1, 20000, d=floor(x); x=(x-d)*10; write("b010521.txt", n, " ", d)); } \\ _Harry J. Smith_, Jun 08 2009
%Y A010521 Cf. A010148 Continued fraction.
%K A010521 nonn,cons
%O A010521 1,1
%A A010521 _N. J. A. Sloane_