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 A010540 #18 Feb 11 2025 14:47:25
%S A010540 9,4,3,3,9,8,1,1,3,2,0,5,6,6,0,3,8,1,1,3,2,0,6,6,0,3,7,7,6,2,2,6,4,0,
%T A010540 7,1,6,9,8,3,6,2,2,6,3,3,4,1,5,1,2,1,3,2,0,6,6,2,9,8,1,4,4,8,9,8,0,0,
%U A010540 2,2,9,0,9,5,8,5,1,1,8,0,5,8,5,4,1,0,2,6,9,8,6,8,9,0,3,8,4,1,0
%N A010540 Decimal expansion of square root of 89.
%C A010540 Continued fraction expansion is 9 followed by {2, 3, 3, 2, 18} repeated. - _Harry J. Smith_, Jun 10 2009
%H A010540 Harry J. Smith, <a href="/A010540/b010540.txt">Table of n, a(n) for n = 1..20000</a>
%H A010540 <a href="/index/Al#algebraic_02">Index entries for algebraic numbers, degree 2</a>.
%e A010540 9.433981132056603811320660377622640716983622633415121320662981448980022...
%t A010540 RealDigits[Sqrt[89],10,120][[1]] (* _Harvey P. Dale_, Nov 20 2011 *)
%o A010540 (PARI) { default(realprecision, 20080); x=sqrt(89); for (n=1, 20000, d=floor(x); x=(x-d)*10; write("b010540.txt", n, " ", d)); } \\ _Harry J. Smith_, Jun 10 2009
%o A010540 (Python)
%o A010540 from math import isqrt
%o A010540 def aupton(nn): return list(map(int, str(isqrt(89 * 10**(2*nn)))))[:nn]
%o A010540 print(aupton(100)) # _Michael S. Branicky_, Sep 04 2021
%Y A010540 Cf. A010161 (continued fraction).
%K A010540 nonn,cons
%O A010540 1,1
%A A010540 _N. J. A. Sloane_