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 A134944 #33 Feb 11 2025 12:16:06 %S A134944 4,0,4,5,0,8,4,9,7,1,8,7,4,7,3,7,1,2,0,5,1,1,4,6,7,0,8,5,9,1,4,0,9,5, %T A134944 2,9,4,3,0,0,7,7,2,9,4,9,5,1,4,4,0,7,1,5,5,3,3,8,6,2,1,5,5,6,7,6,3,1, %U A134944 5,1,1,5,7,0,4,7,2,5,6,1,2,4,2,6,8,0 %N A134944 Decimal expansion of (1 + sqrt(5))/8, the golden ratio divided by 4. %C A134944 Area of quadrilateral with side lengths (sqrt(5)+1)/4, (sqrt(5)-1)/4, 1/2, 1. [And what angles? - _N. J. A. Sloane_, Apr 28 2024] %H A134944 <a href="/index/Al#algebraic_02">Index entries for algebraic numbers, degree 2</a>. %e A134944 0.404508497187... %p A134944 Digits:=100: evalf((1+sqrt(5))/8); # _Wesley Ivan Hurt_, Sep 08 2014 %t A134944 RealDigits[(1 + Sqrt[5])/8, 10, 100][[1]] (* _Wesley Ivan Hurt_, Sep 08 2014 *) %o A134944 (PARI) a(n)=floor(10^n*(1+sqrt(5))/8)%10 \\ _Edward Jiang_, Sep 07 2014 %Y A134944 Cf. A001622, A019863. %K A134944 cons,nonn,easy %O A134944 0,1 %A A134944 _Omar E. Pol_, Nov 15 2007 %E A134944 Edited by _N. J. A. Sloane_, Apr 28 2024