%I A019887
%S A019887 9,7,8,1,4,7,6,0,0,7,3,3,8,0,5,6,3,7,9,2,8,5,6,6,7,4,7,8,6,9,5,9,9,
%T A019887 5,3,2,4,5,9,7,3,7,8,0,8,8,6,2,6,7,7,1,0,7,8,8,5,1,7,7,6,6,3,6,4,0,
%U A019887 5,9,6,8,3,3,1,2,0,0,9,5,1,2,1,9,9,9,7,5,8,5,2,5,4,5,4,7,8,5,6,3,6
%N A019887 Decimal expansion of sine of 78 degrees.
%F A019887 Equals cos(Pi/15) = [sqrt(5)-1]*[1+sqrt(3)*sqrt{5+2*sqrt(5)}]/8 = [A002163-1]*[1+A002194*A019970]/
               8 - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jun 18 2006
%Y A019887 Sequence in context: A163828 A086278 A081855 this_sequence A163931 A011359 
               A154827
%Y A019887 Adjacent sequences: A019884 A019885 A019886 this_sequence A019888 A019889 
               A019890
%K A019887 nonn,cons
%O A019887 0,1
%A A019887 N. J. A. Sloane (njas(AT)research.att.com).