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 A139345 #22 Feb 07 2022 02:52:25 %S A139345 9,9,8,8,8,4,5,0,9,0,9,4,8,8,4,7,9,8,8,3,3,2,6,8,2,4,2,6,3,0,1,2,9,0, %T A139345 4,4,6,3,8,6,5,1,1,9,2,1,2,7,0,5,7,4,4,3,4,5,5,3,9,9,6,6,8,8,1,0,7,1, %U A139345 8,2,3,9,1,8,2,7,9,9,5,4,0,9,2,6,6,8,5,3,3,6,0,4,0,4,4,6,0,2,7,1,8,5,2,1 %N A139345 Decimal expansion of sine of the golden ratio. That is, the decimal expansion of sin((1+sqrt(5))/2). %C A139345 By the Lindemann-Weierstrass theorem, this constant is transcendental. - _Charles R Greathouse IV_, May 13 2019 %H A139345 Mohammad K. Azarian, <a href="https://doi.org/10.35834/1998/1003176">Problem 123</a>, Missouri Journal of Mathematical Sciences, Vol. 10, No. 3 (Fall 1998), p. 176; <a href="https://doi.org/10.35834/2000/1201050">Solution</a>, ibid., Vol. 12, No. 1 (Winter 2000), pp. 61-62. %H A139345 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>. %F A139345 Equals sin(A001622). %F A139345 Equals 1/A139350. - _Amiram Eldar_, Feb 07 2022 %e A139345 0.99888450909488479883326824263012904463865119212705... %t A139345 RealDigits[Sin[GoldenRatio], 10, 100][[1]] (* _Amiram Eldar_, Feb 07 2022 *) %o A139345 (PARI) sin((1+sqrt(5))/2) \\ _Charles R Greathouse IV_, May 13 2019 %Y A139345 Cf. A001622, A094214, A104457, A098317, A002390, A139339, A139340, A139341, A139342, A139350. %K A139345 nonn,cons %O A139345 0,1 %A A139345 _Mohammad K. Azarian_, Apr 15 2008 %E A139345 Leading zero removed by _R. J. Mathar_, Feb 05 2009