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 A171543 #10 Feb 18 2020 10:38:41 %S A171543 3,3,8,0,6,1,7,0,1,8,9,1,4,0,6,6,3,1,0,0,3,8,4,7,3,3,0,9,4,6,3,7,8,1, %T A171543 1,7,0,5,2,3,1,4,3,5,6,0,4,5,3,9,0,8,7,5,5,9,3,1,2,6,8,3,8,2,3,6,7,3, %U A171543 2,7,1,1,9,4,8,8,9,4,4,5,9,2,4,3,7,5,7,2,8,7,2,6,7,6,0,6,2,3,8,7,4,7,9,2,1 %N A171543 Decimal expansion of 2/sqrt(35). %C A171543 The absolute value of the Clebsch-Gordan coupling coefficient <j1 j2; m1 m2 | J M> = <2 3/2 ; -1 3/2 | 7/2 1/2>. %H A171543 Daniel Starodubtsev, <a href="/A171543/b171543.txt">Table of n, a(n) for n = 0..10000</a> %H A171543 Wikipedia, <a href="https://en.wikipedia.org/wiki/Table_of_Clebsch%E2%80%93Gordan_coefficients">Table of Clebsch-Gordan coefficients</a> %F A171543 Equals 2/A010490 = A171538/2. %e A171543 sqrt(4/35) = 2/sqrt(35) = 0.33806170189140663100384733094637811705... %t A171543 RealDigits[2/Sqrt[35],10,120][[1]] (* _Harvey P. Dale_, Aug 23 2014 *) %o A171543 (PARI) 2/sqrt(35) \\ _Michel Marcus_, Feb 18 2020 %Y A171543 Cf. A010490, A171538. %K A171543 cons,easy,nonn %O A171543 0,1 %A A171543 _R. J. Mathar_, Dec 11 2009