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 A019688 #18 Oct 01 2022 00:25:53 %S A019688 1,4,9,5,9,9,6,5,0,1,7,0,9,4,2,5,3,5,1,6,4,8,8,7,7,8,0,1,5,6,1,6,6,8, %T A019688 0,4,0,0,9,3,8,9,0,1,9,0,1,7,8,6,2,1,8,1,9,5,1,1,8,7,8,3,7,7,2,8,9,4, %U A019688 3,6,3,8,3,9,4,5,8,1,3,8,0,8,8,7,0,4,9,2,7,7,3,9,7,2,4,3,6,6,9 %N A019688 Decimal expansion of Pi/21. %H A019688 Ivan Panchenko, <a href="/A019688/b019688.txt">Table of n, a(n) for n = 0..999</a> %H A019688 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a> %e A019688 0.14959965017094253516488778015616680400938901901786218195118783772894.... %t A019688 RealDigits[N[Pi/21,6! ]] (* _Vladimir Joseph Stephan Orlovsky_, Dec 02 2009 *) %o A019688 (PARI) Pi/21 \\ _Charles R Greathouse IV_, Oct 01 2022 %K A019688 nonn,cons %O A019688 0,2 %A A019688 _N. J. A. Sloane_