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 A195722 #20 Nov 21 2024 07:55:12 %S A195722 1,9,9,1,3,3,0,6,6,2,0,7,8,8,6,1,7,4,7,1,1,9,5,8,4,2,0,7,5,5,2,9,6,6, %T A195722 8,1,5,4,4,9,6,2,4,0,9,2,5,0,7,4,7,2,5,2,0,3,7,6,7,3,3,6,9,8,4,9,9,9, %U A195722 5,2,8,5,4,8,8,1,2,7,3,1,7,9,5,7,3,2,8,4,4,1,5,0,9,6,8,5,1,0,5,0,8,8,2,5,6,3,3,8,5,8,7,4,6,5,6,4,1,1,3,4,8,7,5,8,7,0,0,5,1,1 %N A195722 Decimal expansion of arccos(-sqrt(1/6)). %H A195722 G. C. Greubel, <a href="/A195722/b195722.txt">Table of n, a(n) for n = 1..10000</a> %H A195722 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a> %F A195722 Equals Pi - arcsin(sqrt(5/6)) = Pi - arctan(sqrt(5)). - _Amiram Eldar_, Jul 06 2023 %e A195722 arccos(-sqrt(1/6)) = 1.99133066207... %t A195722 RealDigits[ArcCos[-Sqrt[(1/6)]],10,120][[1]] (* _Harvey P. Dale_, May 30 2014 *) %o A195722 (PARI) acos(-sqrt(1/6)) \\ _G. C. Greubel_, Aug 20 2018 %o A195722 (Magma) SetDefaultRealField(RealField(100)); Arccos(-Sqrt(1/6)); // _G. C. Greubel_, Aug 20 2018 %Y A195722 Cf. A195720. %K A195722 nonn,cons %O A195722 1,2 %A A195722 _Clark Kimberling_, Sep 23 2011 %E A195722 Corrected and extended by _Harvey P. Dale_, May 30 2014