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 A179050 #12 Aug 21 2023 11:38:07 %S A179050 8,1,2,2,9,9,2,4,0,5,8,2,2,6,5,8,1,5,3,8,9,6,7,8,5,3,0,5,3,7,8,3,6,1, %T A179050 6,2,3,8,7,2,5,8,6,7,8,8,0,3,6,8,7,7,5,0,7,6,9,5,1,1,7,9,7,8,4,1,6,8, %U A179050 2,2,5,2,4,0,1,8,6,2,3,7,0,8,0,6,7,1,9,3,3,8,6,1,7,4,1,2,6,2,6,2,0,4,2,5,9 %N A179050 Decimal expansion of 5/(2*sqrt(5+2*sqrt(5))), area of regular pentagram with base edge length 1. %C A179050 An algebraic number of degree 4: the smaller positive root of 16x^4 - 200x^2 + 125. - _Charles R Greathouse IV_, Dec 03 2012 %H A179050 Thomas M. Green, <a href="http://www.contracosta.edu/legacycontent/math/stararea.htm">Area of Pentagram</a> %H A179050 <a href="/index/Al#algebraic_04">Index entries for algebraic numbers, degree 4</a> %e A179050 0.81229924058226581538967853053783616238725867880368775076951179784168... %t A179050 a=1;area=5/(2*Sqrt[5+2*Sqrt[5]]);RealDigits[N[area,20]] %o A179050 (PARI) 5/sqrt(20+8*sqrt(5)) \\ _Charles R Greathouse IV_, Dec 03 2012 %Y A179050 Cf. A002194, A010502, A102771, A120011, A179047, A179048, A104956. %K A179050 nonn,cons,easy %O A179050 0,1 %A A179050 _Vladimir Joseph Stephan Orlovsky_, Jun 26 2010 %E A179050 Offset corrected, keyword:cons inserted by _R. J. Mathar_, Jun 28 2010 %E A179050 Name corrected by _Charles R Greathouse IV_, Dec 03 2012