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 A195771 #13 Nov 21 2024 07:58:33 %S A195771 1,3,6,9,4,3,8,4,0,6,0,0,4,5,6,5,8,2,7,7,7,6,1,9,6,1,3,9,4,2,2,1,2,8, %T A195771 0,3,1,8,5,8,5,4,6,6,1,8,2,8,5,3,2,4,5,2,4,2,3,0,2,2,1,0,5,2,6,9,8,2, %U A195771 9,8,8,2,8,5,1,4,2,5,2,6,4,8,9,3,8,1,7,2,4,8,2,5,8,0,6,5,8,5,9,7 %N A195771 Decimal expansion of arcsec(5). %H A195771 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a> %F A195771 Equals arcsin(2*sqrt(6)/5) = arccos(1/5) = arctan(2*sqrt(6)). - _Amiram Eldar_, May 24 2021 %e A195771 arcsec(5) = 1.3694384060045658277761961394221280318585... %t A195771 (See A195769.) %t A195771 RealDigits[ArcSec[5],10,120][[1]] (* _Harvey P. Dale_, Aug 27 2023 *) %o A195771 (PARI) acos(1/5) \\ _Charles R Greathouse IV_, Nov 21 2024 %Y A195771 Cf. A195769. %K A195771 nonn,cons %O A195771 1,2 %A A195771 _Clark Kimberling_, Sep 24 2011