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 A020820 #24 Sep 08 2019 01:08:04 %S A020820 1,2,5,9,8,8,1,5,7,6,6,9,7,4,2,4,0,9,0,7,1,5,0,5,5,1,2,0,7,8,0,6,0,0, %T A020820 2,0,2,7,1,9,1,7,1,0,3,9,5,6,3,0,7,1,5,1,4,4,6,1,1,1,1,6,4,7,2,3,8,6, %U A020820 0,4,2,0,1,5,3,8,2,3,0,2,9,8,9,3,3,5,2,0,4,2,2,1,3,0,7,3,5,0,5 %N A020820 Decimal expansion of 1/sqrt(63). %H A020820 Vincenzo Librandi, <a href="/A020820/b020820.txt">Table of n, a(n) for n = 0..1000</a> %F A020820 1/sqrt(63) = 1/(3*sqrt(7)) = sqrt(7)/21. %e A020820 0.1259881576697424090715055120780600202719171039563071... %p A020820 Digits:=100: evalf(1/sqrt(63)); # _Wesley Ivan Hurt_, Sep 01 2016 %t A020820 RealDigits[Sqrt[1/63],10,120][[1]] (* _Harvey P. Dale_, Jun 14 2011 *) %Y A020820 Cf. A010516, A040055. %K A020820 nonn,cons %O A020820 0,2 %A A020820 _N. J. A. Sloane_