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 A020817 #15 Jul 08 2025 07:53:09
%S A020817 1,2,9,0,9,9,4,4,4,8,7,3,5,8,0,5,6,2,8,3,9,3,0,8,8,4,6,6,5,9,4,1,3,3,
%T A020817 2,0,3,6,1,0,9,7,3,9,0,1,7,6,3,8,6,3,6,0,8,8,6,2,5,2,4,5,8,8,7,0,4,4,
%U A020817 9,4,3,6,3,9,7,8,9,9,3,0,1,1,1,7,3,0,9,5,7,9,2,2,8,6,2,2,4,5,0
%N A020817 Decimal expansion of 1/sqrt(60).
%C A020817 Equals 0.12909...= sqrt(5/3)/10 where sqrt(5/3) = sum_{n=0..infinity} binomial(2n,n)/10^n [Lehmer, Am. Math. Monthly 92 (1985) 449] [From _R. J. Mathar_, Mar 04 2009]
%H A020817 Ivan Panchenko, <a href="/A020817/b020817.txt">Table of n, a(n) for n = 0..1000</a>
%t A020817 RealDigits[N[1/Sqrt[60], 200]] (* _Vladimir Joseph Stephan Orlovsky_, Jun 12 2011 *)
%K A020817 nonn,cons
%O A020817 0,2
%A A020817 _N. J. A. Sloane_