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 A019895 #20 Jun 26 2025 11:07:27 %S A019895 9,9,7,5,6,4,0,5,0,2,5,9,8,2,4,2,4,7,6,1,3,1,6,2,6,8,0,6,4,4,2,5,5,0, %T A019895 2,6,3,6,9,3,7,7,6,6,0,3,8,4,2,2,1,5,3,6,2,2,5,9,9,5,6,0,8,8,9,8,2,1, %U A019895 9,1,8,1,4,1,1,0,8,1,8,4,3,0,8,5,2,8,9,2,1,1,6,7,5,4,7,6,0,3,7 %N A019895 Decimal expansion of sine of 86 degrees. %H A019895 Ivan Panchenko, <a href="/A019895/b019895.txt">Table of n, a(n) for n = 0..1000</a> %F A019895 Equals cos(Pi/45) = 2F1(8/15,7/15;1/2;3/4) / 2. - _R. J. Mathar_, Oct 27 2008 %F A019895 Equals 2*A019852*A019856. - _R. J. Mathar_, Jan 17 2021 %e A019895 0.99756405025982424761316268064425502636937766038422... %p A019895 Digits:=100: evalf(cos(Pi/45)); # _Wesley Ivan Hurt_, Aug 31 2014 %t A019895 RealDigits[Cos[Pi/45], 10, 100, -1][[1]] (* _Wesley Ivan Hurt_, Aug 31 2014 *) %o A019895 (PARI) cos(Pi/45) \\ _Stefano Spezia_, Feb 09 2025 %Y A019895 Cf. A019852, A019856. %K A019895 nonn,cons %O A019895 0,1 %A A019895 _N. J. A. Sloane_