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 A171536 #5 Jan 02 2022 12:04:45 %S A171536 7,5,5,9,2,8,9,4,6,0,1,8,4,5,4,4,5,4,4,2,9,0,3,3,0,7,2,4,6,8,3,6,0,1, %T A171536 2,1,6,3,1,5,0,2,6,2,3,7,3,7,8,4,2,9,0,8,6,7,6,6,6,6,9,8,8,3,4,3,1,6, %U A171536 2,5,2,0,9,2,2,9,3,8,1,7,9,3,6,0,1,1,2,2,5,3,2,7,8,4,4,1,0,3,1,6,0,4,3,0,4 %N A171536 Decimal expansion of 2/sqrt(7). %C A171536 The absolute value of the Clebsch-Gordan coupling coefficient <j1 j2; m1 m2 | J M> = <2 3/2 ; -2 -1/2 | 5/2 -5/2>. %H A171536 Wikipedia, <a href="https://en.wikipedia.org/wiki/Table_of_Clebsch%E2%80%93Gordan_coefficients">Table of Clebsch-Gordan coefficients</a> %F A171536 equals 2*A020764 = 2/A010465. %e A171536 sqrt(4/7) = 0.75592894601845445442903307... %t A171536 RealDigits[2/Sqrt[7],10,120][[1]] (* _Harvey P. Dale_, Jan 02 2022 *) %K A171536 cons,easy,nonn %O A171536 0,1 %A A171536 _R. J. Mathar_, Dec 11 2009