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 A195731 #16 Nov 21 2024 07:58:04 %S A195731 1,3,1,8,1,1,6,0,7,1,6,5,2,8,1,7,9,6,5,7,4,5,6,6,4,2,5,4,6,4,6,0,4,0, %T A195731 4,6,9,8,4,6,3,9,0,9,6,6,5,9,0,7,1,4,7,1,6,8,5,3,5,4,8,5,1,7,4,1,3,3, %U A195731 3,3,1,4,2,6,6,2,0,8,3,2,7,6,9,0,2,2,6,8,6,7,0,4,4,3,0,4,3,9,3,2 %N A195731 Decimal expansion of arcsec(4). %H A195731 G. C. Greubel, <a href="/A195731/b195731.txt">Table of n, a(n) for n = 1..10000</a> %H A195731 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a> %F A195731 Equals arcsin(sqrt(15)/4) = arccos(1/4) = arctan(sqrt(15)). - _Amiram Eldar_, May 24 2021 %e A195731 arcsec(4) = 1.318116071652817965... %t A195731 r=4; %t A195731 N[ArcSec[r], 100] %t A195731 RealDigits[%] %o A195731 (PARI) acos(1/4) \\ _G. C. Greubel_, Aug 20 2018 %o A195731 (Magma) SetDefaultRealField(RealField(100)); Arccos(1/4); // _G. C. Greubel_, Aug 20 2018 %Y A195731 Cf. A195628. %K A195731 nonn,cons %O A195731 1,2 %A A195731 _Clark Kimberling_, Sep 23 2011