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 A387294 #13 Sep 02 2025 05:58:11 %S A387294 2,9,5,7,0,8,0,0,7,9,6,3,5,4,4,8,1,5,1,5,6,1,8,7,2,5,8,1,3,4,5,0,3,7, %T A387294 6,5,3,0,5,1,8,0,8,7,0,0,4,0,8,9,9,7,9,2,3,0,0,0,5,1,8,7,0,3,7,2,7,8, %U A387294 5,7,5,7,7,5,3,2,0,1,3,8,4,9,7,2,2,0,0,6,3,9 %N A387294 Decimal expansion of the largest dihedral angle, in radians, in a gyroelongated triangular cupola (Johnson solid J_22). %C A387294 This is the dihedral angle between a triangular face in the antiprism part of the solid and a triangular face in the cupola part of the solid. %C A387294 Also the analogous dihedral angle in a gyroelongated triangular bicupola (Johnson solid J_44). %H A387294 Paolo Xausa, <a href="/A387294/b387294.txt">Table of n, a(n) for n = 1..10000</a> %H A387294 Wikipedia, <a href="https://en.wikipedia.org/wiki/Gyroelongated_triangular_bicupola">Gyroelongated triangular bicupola</a>. %H A387294 Wikipedia, <a href="https://en.wikipedia.org/wiki/Gyroelongated_triangular_cupola">Gyroelongated triangular cupola</a>. %F A387294 Equals arccos(1/3) + arccos(1 - 2*sqrt(3)/3) = A137914 + arccos(-A246724). %e A387294 2.9570800796354481515618725813450376530518087004... %t A387294 First[RealDigits[ArcSec[3] + ArcCos[1 - Sqrt[12]/3], 10, 100]] (* or *) %t A387294 First[RealDigits[Max[PolyhedronData["J22", "DihedralAngles"]], 10, 100]] %Y A387294 Cf. other J_22 dihedral angles: A195698, A387295, A387296, A387297. %Y A387294 Cf. A344076 (J_22 volume), A344077 (J_22 surface area). %Y A387294 Cf. A385256 (J_44 volume), A385257 (J_44 surface area). %Y A387294 Cf. A137914, A246724. %K A387294 nonn,cons,easy,new %O A387294 1,1 %A A387294 _Paolo Xausa_, Aug 25 2025