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 A179452 #26 Feb 16 2025 08:33:12 %S A179452 1,5,3,8,8,4,1,7,6,8,5,8,7,6,2,6,7,0,1,2,8,5,1,4,5,2,8,8,0,1,8,4,5,4, %T A179452 9,1,2,0,0,3,3,5,1,0,7,1,7,6,8,8,9,6,2,1,3,5,1,9,5,7,8,1,2,5,1,8,7,4, %U A179452 3,1,6,4,4,2,4,7,5,4,5,4,5,9,2,2,7,2,9,6,8,6,0,8,3,3,5,5,2,7,1,7,6,3,5,9,5 %N A179452 Decimal expansion of sqrt(5 + 2*sqrt(5))/2, the height of a regular pentagon and midradius of an icosidodecahedron with side length 1. %C A179452 Icosidodecahedron: 32 faces, 30 vertices, and 60 edges. %C A179452 Height of a regular pentagon with side length 1. - _Jared Kish_, Oct 16 2014 %C A179452 Volume of a regular decagonal prism with unit side length and height 2. - _Wesley Ivan Hurt_, May 04 2021 %H A179452 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Icosidodecahedron.html">Icosidodecahedron</a> %H A179452 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Pentagon.html">Pentagon</a> %H A179452 <a href="/index/Al#algebraic_04">Index entries for algebraic numbers, degree 4</a> %F A179452 Equals sqrt(5+2*sqrt(5))/2. %e A179452 1.53884176858762670128514528801845491200335107176889621351957812518743... %p A179452 sqrt(5+2*sqrt(5.))/2 %t A179452 RealDigits[Sqrt[5+2Sqrt[5]]/2,10,120][[1]] (* _Harvey P. Dale_, Jun 23 2017 *) %o A179452 (PARI) sqrt(5+2*sqrt(5))/2 %Y A179452 Cf. A010527, A102208, A179290, A179292, A179294, A179449, A179450, A179451. %K A179452 nonn,cons,easy %O A179452 1,2 %A A179452 _Vladimir Joseph Stephan Orlovsky_, Jul 14 2010 %E A179452 Partially rewritten by _Charles R Greathouse IV_, Feb 03 2011 %E A179452 Edited by _M. F. Hasler_, Oct 16 2014