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 A331480 #5 Jan 18 2020 08:53:50 %S A331480 6,9,0,1,0,7,0,9,1,3,7,4,5,3,9,9,5,2,0,0,4,3,7,7,9,0,9,0,7,0,8,5,0,7, %T A331480 2,0,0,6,9,8,3,3,0,9,9,7,0,0,0,5,1,0,8,7,0,3,8,4,6,5,6,1,3,9,8,4,8,2, %U A331480 0,1,9,5,5,5,0,4,6,3,4,0,8,9,0,7,0,5,2,8,7,7,5 %N A331480 Decimal expansion of arcsin(2/Pi). %F A331480 Equals Pi/2 - A275477. %e A331480 0.69010709137453995200... %t A331480 First@RealDigits@N[ArcSin[2/Pi], 120] %o A331480 (PARI) default(realprecision, 100); asin(2/Pi) %Y A331480 Cf. A060294 (decimal expansion of 2/Pi), A275477 (arccos(2/Pi)), A232247 (arctan(2/Pi)), A232182 (arccot(2/Pi)). %K A331480 nonn,cons %O A331480 0,1 %A A331480 _Jianing Song_, Jan 18 2020