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 A160581 #16 Aug 08 2025 15:04:57
%S A160581 2,1,6,9,1,9,6,8,1,2,2,8,6,5,9,5,6,9,6,8,6,9,2,9,1,2,2,0,7,4,8,0,8,8,
%T A160581 9,9,2,7,4,6,6,7,2,7,2,9,9,8,6,9,5,3,3,2,2,0,9,3,5,7,4,6,3,3,8,8,4,9,
%U A160581 9,3,7,9,4,4,3,2,2,5,7,2,0,5,0,8,2,5,0,9,7,5,8,1,4,9,7,3,5,3,9,1,8,4,8,7,1
%N A160581 Decimal expansion of (601+276*sqrt(2))/457.
%C A160581 Equals lim_{n -> oo} b(n)/b(n-1) for n mod 3 = {1, 2}, b = A129642.
%C A160581 Equals lim_{n -> oo} b(n)/b(n-1) for n mod 3 = {0, 2}, b = A160580.
%H A160581 G. C. Greubel, <a href="/A160581/b160581.txt">Table of n, a(n) for n = 1..10000</a>
%F A160581 Equals (23+6*sqrt(2))/(23-6*sqrt(2)).
%e A160581 (601+276*sqrt(2))/457 = 2.16919681228659569686...
%t A160581 RealDigits[(601 +276*Sqrt[2])/457, 10, 100][[1]] (* _G. C. Greubel_, Apr 08 2018 *)
%o A160581 (PARI) (601 +276*sqrt(2))/457 \\ _G. C. Greubel_, Apr 08 2018
%o A160581 (Magma) (601 +276*Sqrt(2))/457; // _G. C. Greubel_, Apr 08 2018
%Y A160581 Cf. A002193, A129642, A160580, A160582.
%K A160581 nonn,cons,easy
%O A160581 1,1
%A A160581 _Klaus Brockhaus_, Jun 08 2009