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 A157214 #13 Aug 21 2023 12:36:43
%S A157214 2,5,0,7,1,0,6,7,8,1,1,8,6,5,4,7,5,2,4,4,0,0,8,4,4,3,6,2,1,0,4,8,4,9,
%T A157214 0,3,9,2,8,4,8,3,5,9,3,7,6,8,8,4,7,4,0,3,6,5,8,8,3,3,9,8,6,8,9,9,5,3,
%U A157214 6,6,2,3,9,2,3,1,0,5,3,5,1,9,4,2,5,1,9,3,7,6,7,1,6,3,8,2,0,7,8,6,3,6,7,5,0
%N A157214 Decimal expansion of 18 + 5*sqrt(2).
%C A157214 lim_{n -> infinity} b(n)/b(n-1) = (18+5*sqrt(2))/(18-5*sqrt(2)) for n mod 3 = {1, 2}, b = A129544.
%C A157214 lim_{n -> infinity} b(n)/b(n-1) = (18+5*sqrt(2))/(18-5*sqrt(2)) for n mod 3 = {0, 2}, b = A157213.
%H A157214 G. C. Greubel, <a href="/A157214/b157214.txt">Table of n, a(n) for n = 2..5000</a>
%H A157214 <a href="/index/Al#algebraic_02">Index entries for algebraic numbers, degree 2</a>
%F A157214 Equals 18 + 10*A010503. - _R. J. Mathar_, Feb 27 2009
%e A157214 18+5*sqrt(2) = 25.07106781186547524400...
%t A157214 RealDigits[18+5Sqrt[2],10,150][[1]] (* _Harvey P. Dale_, Mar 18 2011 *)
%o A157214 (PARI) 18 + 5*sqrt(2) \\ _G. C. Greubel_, Nov 28 2017
%o A157214 (Magma) [18 + 5*Sqrt(2)]; // _G. C. Greubel_, Nov 28 2017
%Y A157214 Cf. A129544, A157213, A157215 (decimal expansion of 18-5*sqrt(2)), A157216 (decimal expansion of (18-5*sqrt(2))/(18+5*sqrt(2))).
%K A157214 cons,nonn
%O A157214 2,1
%A A157214 _Klaus Brockhaus_, Feb 25 2009