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 A187426 #46 Feb 04 2025 14:55:38 %S A187426 1,9,0,9,8,3,0,0,5,6,2,5,0,5,2,5,7,5,8,9,7,7,0,6,5,8,2,8,1,7,1,8,0,9, %T A187426 4,1,1,3,9,8,4,5,4,1,0,0,9,7,1,1,8,5,6,8,9,3,2,2,7,5,6,8,8,6,4,7,3,6, %U A187426 9,7,6,8,5,9,0,5,4,8,7,7,5,1,4 %N A187426 Decimal expansion of (3-phi)^2 = 10 - 5*phi where phi is the golden ratio. %C A187426 This is an integer in Q(sqrt(5)). - _Wolfdieter Lang_, Jan 07 2018 %H A187426 Ivan Panchenko, <a href="/A187426/b187426.txt">Table of n, a(n) for n = 1..1000</a> %H A187426 <a href="/index/Al#algebraic_02">Index entries for algebraic numbers, degree 2</a>. %F A187426 (3-phi)^2 = 5/phi^2 = 10 - 5*phi. %F A187426 Smaller root of x^2 - 15x + 25 = 0. %F A187426 Equals 10*A187798-5. - _R. J. Mathar_, Feb 08 2023 %e A187426 1.909830... %t A187426 RealDigits[(3-GoldenRatio)^2,10,120][[1]] (* _Harvey P. Dale_, Jun 30 2017 *) %o A187426 (PARI) (15-5*sqrt(5))/2 \\ _Charles R Greathouse IV_, Aug 31 2013 %o A187426 (PARI) polrootsreal(x^2-15*x+25)[1] \\ _Charles R Greathouse IV_, Feb 04 2025 %Y A187426 Cf. A226765. %Y A187426 Apart from the first digit the same as A187798. %K A187426 nonn,cons %O A187426 1,2 %A A187426 _Joost Gielen_, Aug 30 2013 %E A187426 Corrected and extended by _Charles R Greathouse IV_, Aug 31 2013