A389307 - OEIS

A389307

Decimal expansion of the second smallest dihedral angle, in radians, in a pentagonal orthocupolarotunda (Johnson solid J_32).

1, 9, 3, 5, 6, 6, 0, 1, 5, 4, 9, 0, 8, 3, 7, 9, 8, 0, 0, 9, 5, 8, 7, 2, 0, 0, 2, 1, 5, 4, 6, 4, 1, 1, 7, 8, 9, 7, 9, 6, 8, 3, 7, 6, 5, 6, 7, 1, 1, 4, 0, 9, 7, 5, 5, 8, 4, 1, 9, 4, 7, 0, 4, 1, 8, 8, 4, 8, 1, 7, 6, 5, 2, 9, 7, 6, 4, 8, 8, 0, 6, 8, 7, 1, 1, 7, 5, 9, 1, 1

(list; constant; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

This is the dihedral angle between a triangular face and a square face at the edge where the cupola and rotunda parts of the solid meet.

Also a dihedral angle in a bilunabirotunda and triangular hebesphenorotunda (Johnson solids J_91 and J_92, respectively).

LINKS

Paolo Xausa, Table of n, a(n) for n = 1..10000

Polytope Wiki, Bilunabirotunda.

Polytope Wiki, Pentagonal orthocupolarotunda.

Polytope Wiki, Triangular hebesphenorotunda.

Wikipedia Bilunabirotunda.