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 A227400 #32 Aug 21 2023 12:13:13 %S A227400 6,3,6,6,1,0,0,1,8,7,5,0,1,7,5,2,5,2,9,9,2,3,5,5,2,7,6,0,5,7,2,6,9,8, %T A227400 0,3,7,9,9,4,8,4,7,0,0,3,2,3,7,2,8,5,6,3,1,0,7,5,8,5,6,2,8,8,2,4,5,6, %U A227400 5,8,9,5,3,0,1,8,2,9,2,5,0,4,8,7,9,8 %N A227400 Decimal expansion of 5/(3*phi^2) where phi is the golden ratio. %C A227400 An algebraic number of degree 2. - _Charles R Greathouse IV_, Sep 28 2013 %C A227400 A quadratic number with denominator 2; minimal polynomial 9x^2 -15x + 25. - _Charles R Greathouse IV_, Apr 21 2016 %H A227400 <a href="/index/Al#algebraic_02">Index entries for algebraic numbers, degree 2</a> %F A227400 5/(3*phi^2), with phi = (1 + sqrt(5))/2. %e A227400 0.6366100187501752529923552760572698037994847... %t A227400 RealDigits[5/(3*GoldenRatio^2), 10, 100][[1]] (* _Alonso del Arte_, Sep 28 2013 *) %o A227400 (PARI) (15-5*sqrt(5))/6 \\ _Charles R Greathouse IV_, Sep 28 2013 %K A227400 nonn,cons %O A227400 0,1 %A A227400 _Joost Gielen_, Sep 20 2013