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 A245670 #10 Oct 14 2015 17:19:48 %S A245670 4,9,7,4,2,2,6,1,1,9,2,8,5,6,4,2,1,8,7,6,8,4,9,7,5,6,2,1,6,4,4,2,6,2, %T A245670 7,4,3,9,8,5,4,7,1,0,6,6,9,0,6,5,7,5,8,5,5,6,2,5,9,5,4,2,4,6,5,4,1,2, %U A245670 4,4,7,3,4,4,6,4,0,1,0,3,8,2,7,2,0,9,3,2,2,9,2,0,2,9,6,0,1,1,8,9,1,7,5,3,1 %N A245670 Decimal expansion of 28*sqrt(3) - 48. %C A245670 Construct the largest possible square inside a given equilateral triangle. This constant is the ratio of the area of the square to the area of the triangle. %F A245670 28*sqrt(3) - 48 = 28*A002194 - 48. %e A245670 0.4974226119285642187684975621644262743985... %t A245670 RealDigits[28*Sqrt[3]-48,10,120][[1]] (* _Harvey P. Dale_, Oct 14 2015 *) %o A245670 (PARI) %o A245670 default(realprecision, 120); %o A245670 28*sqrt(3)-48 %Y A245670 Cf. A002194. %K A245670 cons,nonn %O A245670 0,1 %A A245670 _Rick L. Shepherd_, Jul 28 2014