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 A381672 #8 Mar 05 2025 09:26:25 %S A381672 8,2,8,7,9,7,7,1,9,2,5,2,0,1,2,0,2,1,5,0,0,5,8,1,0,0,3,8,1,2,9,6,3,5, %T A381672 7,5,8,6,1,7,8,3,0,3,0,8,7,2,3,3,8,2,6,7,7,4,6,4,0,7,0,4,6,1,9,3,7,9, %U A381672 8,9,9,5,0,2,1,0,8,1,9,4,0,5,9,0,0,8,8,0,5,8 %N A381672 Decimal expansion of the isoperimetric quotient of a regular icosahedron. %C A381672 For the definition of isoperimetric quotient of a solid, see A381671. %H A381672 Paolo Xausa, <a href="/A381672/b381672.txt">Table of n, a(n) for n = 0..10000</a> %F A381672 Equals Pi*phi^4/(15*sqrt(3)) = A000796*A374883/(15*A002194). %e A381672 0.8287977192520120215005810038129635758617830308723... %t A381672 First[RealDigits[Pi*GoldenRatio^4/(15*Sqrt[3]), 10, 100]] %Y A381672 Cf. A273637 (sphericity). %Y A381672 Cf. isoperimetric quotient of other Platonic solids: A019673 (cube), A073010 (octahedron), A374772 (dodecahedron), A381671 (tetrahedron). %Y A381672 Cf. A000796, A002194, A374883. %K A381672 nonn,cons,easy %O A381672 0,1 %A A381672 _Paolo Xausa_, Mar 03 2025