0,1
Radius of the inscribed sphere (tangent to the faces) for a regular tetrahedron with unit edges. - Stanislav Sykora, Nov 20 2013
Ivan Panchenko, Table of n, a(n) for n = 0..1000
Wikipedia, Tetrahedron
1/Sqrt(24)=0.20412414523193150818310700622549094933... [Vladimir Joseph Stephan Orlovsky, May 30 2010]
RealDigits[N[1/Sqrt[24], 200]] (* Vladimir Joseph Stephan Orlovsky, May 30 2010 *)
Cf. Platonic solids inradii: A020763 (octahedron), A179294 (icosahedron), A237603 (dodecahedron). - Stanislav Sykora, Feb 25 2014
Sequence in context: A318366 A300252 A305796 * A007432 A079124 A242071
Adjacent sequences: A020778 A020779 A020780 * A020782 A020783 A020784
nonn,cons
N. J. A. Sloane.
approved