%I A137915
%S A137915 7,0,5,2,8,7,7,9,3,6,5,5,0,9,3,0,8,6,3,0,7,5,4,0,0,0,6,6,0,0,3,7,5,6,4,
%T A137915 0,3,6,9,9,3,1,5,6,8,9,9,0,9,2,0,5,1,7,1,1,8,2,8,8,9,3,6,4,3,9,6,0,2,5,
%U A137915 3,5,6,1,9,3,9,6,0,4,4,3,6,6,3,8,1,2,8,7,1,1,6,3,9,4,1,2,3,5,4,3,1,4,8
%N A137915 Decimal expansion of 180*arccos(1/3)/Pi.
%C A137915 Dihedral angle in degrees of regular tetrahedron.
%H A137915 Jackson, Frank and Weisstein, Eric W., <a href="http://mathworld.wolfram.com/
               Tetrahedron.html">Tetrahedron</a>
%H A137915 Weisstein, Eric W., <a href="http://mathworld.wolfram.com/DihedralAngle.html">
               Dihedral Angle</a>
%F A137915 180*A137914/Pi = 180*arccos(1/3)/Pi.
%e A137915 70.52877936550930863075400066003756403699315689909205171182889364396025356...
%o A137915 (PARI) 180*acos(1/3)/Pi
%Y A137915 Cf. A137914 (same in radians).
%Y A137915 Sequence in context: A033150 A064648 A116198 this_sequence A130203 A011479 
               A153871
%Y A137915 Adjacent sequences: A137912 A137913 A137914 this_sequence A137916 A137917 
               A137918
%K A137915 cons,nonn
%O A137915 2,1
%A A137915 Rick L. Shepherd (rshepherd2(AT)hotmail.com), Feb 22 2008