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%I #9 Aug 21 2023 12:36:59
%S 1,0,9,2,8,9,3,2,1,8,8,1,3,4,5,2,4,7,5,5,9,9,1,5,5,6,3,7,8,9,5,1,5,0,
%T 9,6,0,7,1,5,1,6,4,0,6,2,3,1,1,5,2,5,9,6,3,4,1,1,6,6,0,1,3,1,0,0,4,6,
%U 3,3,7,6,0,7,6,8,9,4,6,4,8,0,5,7,4,8,0,6,2,3,2,8,3,6,1,7,9,2,1,3,6,3,2,4,9
%N Decimal expansion of 18 - 5*sqrt(2).
%C 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 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 G. C. Greubel, <a href="/A157215/b157215.txt">Table of n, a(n) for n = 2..5001</a>
%H <a href="/index/Al#algebraic_02">Index entries for algebraic numbers, degree 2</a>
%e 18 - 5*sqrt(2) = 10.92893218813452475599...
%t RealDigits[18 - 5*Sqrt[2], 10, 50][[1]] (* _G. C. Greubel_, Nov 28 2017 *)
%o (PARI) 18 - 5*sqrt(2) \\ _G. C. Greubel_, Nov 28 2017
%o (Magma) [18 - 5*Sqrt(2)]; // _G. C. Greubel_, Nov 28 2017
%Y Cf. A129544, A157213, A157214 (decimal expansion of 18+5*sqrt(2)), A157216 (decimal expansion of (18-5*sqrt(2))/(18+5*sqrt(2))).
%K cons,nonn
%O 2,3
%A _Klaus Brockhaus_, Feb 25 2009
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