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 A353772 #5 May 07 2022 09:41:01 %S A353772 9,5,4,8,5,4,6,6,5,9,6,6,1,5,6,7,8,0,1,4,5,5,0,9,5,2,8,0,3,3,6,9,0,5, %T A353772 8,9,6,0,2,4,7,1,4,7,0,9,8,7,5,7,2,3,4,0,9,8,0,2,0,0,8,3,5,1,3,3,4,2, %U A353772 7,0,0,4,5,7,9,9,0,5,9,5,5,1,3,2,1,0,3,7,3,5,2,7,7,0,0,1,0,4,7,9,0,6,2,6,2 %N A353772 Decimal expansion of the gravitational acceleration generated at a vertex by a unit-mass regular tetrahedron with edge length 2 in units where the gravitational constant is G = 1. %C A353772 The absolute value of the gravitational attraction force between a homogeneous regular tetrahedron with mass M and edge length 2*s and a test particle with mass m located at the tetrahedron's vertex is c*G*M*m/s^2, where G is the gravitational constant (A070058) and c is this constant. %C A353772 The vertices are the positions where the gravitational field that is generated by the tetrahedron on its surface attains its minimum absolute value. %H A353772 Murray S. Klamkin, <a href="https://www.jstor.org/stable/2132789">Extreme Gravitational Attraction</a>, Problem 92-5, SIAM Review, Vol. 34, No. 1 (1992), pp. 120-121; <a href="https://www.jstor.org/stable/2132502">Solution</a>, by Carl C. Grosjean, ibid., Vol. 38, No. 3 (1996), pp. 515-520. %H A353772 Eric Weisstein's World of Physics, <a href="https://scienceworld.wolfram.com/physics/PolyhedronGravitationalForce.html">Polyhedron Gravitational Force</a>. %H A353772 Eric Weisstein's World of Physics, <a href="https://scienceworld.wolfram.com/physics/TetrahedronGravitationalForce.html">Tetrahedron Gravitational Force</a>. %F A353772 Equals 6*sqrt(3)*(Pi/3 - arctan(sqrt(2))). %F A353772 Equals 3*sqrt(3)*(Pi/6 - arctan(sqrt(2)/4)). %e A353772 0.95485466596615678014550952803369058960247147098757... %t A353772 RealDigits[6*Sqrt[3]*(Pi/3 - ArcTan[Sqrt[2]]), 10, 100][[1]] %Y A353772 Cf. A070058, A353769, A353770, A353771, A353773. %K A353772 nonn,cons %O A353772 0,1 %A A353772 _Amiram Eldar_, May 07 2022