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 A195694 #12 Nov 21 2024 07:52:38 %S A195694 2,2,3,7,0,3,5,7,5,9,2,8,7,4,1,1,8,7,4,3,3,5,3,2,6,5,8,7,6,1,7,5,4,4, %T A195694 1,6,2,7,6,6,0,7,4,8,3,8,4,1,3,5,0,0,7,5,3,3,1,8,9,4,6,1,3,8,9,5,7,8, %U A195694 8,7,1,9,2,5,2,2,1,6,3,7,8,1,0,2,1,9,2,4,2,4,3,8,4,0,6,3,9,6,6,9 %N A195694 Decimal expansion of arccos(-1/r), where r = (1+sqrt(5))/2 (the golden ratio). %C A195694 Let c1 and c2 be the constants at A195692 and A195694; then c1+c2 = Pi. %H A195694 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a> %e A195694 arccos(-1/r) = 2.2370357592874118743353265876175441... %t A195694 (See A195692.) %t A195694 RealDigits[ArcCos[-1/GoldenRatio],10,120][[1]] (* _Harvey P. Dale_, Jan 15 2012 *) %o A195694 (PARI) acos(-2/(sqrt(5)+1)) \\ _Charles R Greathouse IV_, Nov 21 2024 %Y A195694 Cf. A001622, A175288, A195692, A195693. %K A195694 nonn,cons %O A195694 1,1 %A A195694 _Clark Kimberling_, Sep 22 2011