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 A019697 #19 Jul 08 2025 07:34:53 %S A019697 5,7,1,1,9,8,6,6,4,2,8,9,0,5,3,3,1,6,0,8,4,1,1,6,9,7,8,7,7,8,0,9,1,4, %T A019697 3,3,4,9,0,3,9,4,4,3,6,2,5,0,0,1,9,2,4,0,1,7,7,2,6,2,6,5,3,1,4,6,8,7, %U A019697 5,7,1,0,2,3,3,8,5,6,1,8,1,5,6,8,7,3,3,6,0,4,6,0,7,6,5,7,6,4,8 %N A019697 Decimal expansion of 2*Pi/11. %C A019697 The famous rose window of the Troia cathedral in Apulia, Italy, consists of eleven columns that radiate from the center with unusual angles 2Pi/11 = 32.72... °. - _Jean-François Alcover_, May 25 2015 %H A019697 Ivan Panchenko, <a href="/A019697/b019697.txt">Table of n, a(n) for n = 0..1000</a> %H A019697 Wikipedia, <a href="http://en.wikipedia.org/wiki/Troia_Cathedral">Troia Cathedral</a> %H A019697 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a> %t A019697 RealDigits[(2Pi)/11,10,120][[1]] (* _Harvey P. Dale_, Apr 20 2013 *) %o A019697 (PARI) 2*Pi/11 \\ _Charles R Greathouse IV_, Oct 01 2022 %Y A019697 Equals twice A019678. %K A019697 nonn,cons %O A019697 0,1 %A A019697 _N. J. A. Sloane_