%I #14 Jun 26 2023 02:21:23
%S 3,1,3,0,9,2,6,4,4,2,0,1,2,2,7,3,0,8,9,7,6,3,4,3,8,7,0,9,5,6,0,1,3,2,
%T 7,1,3,4,0,3,1,2,9,9,4,4,7,7,1,6,5,5,2,2,5,1,9,7,8,2,1,3,0,4,2,9,8,1,
%U 2,0,7,7,1,2,1,9,2,2,1,4,8,5,8,3,9,2,1,4,7,1,6,7,2,0,7,9,7,6,1,7,0,3,6,3,3
%N Decimal expansion of 22*sin(Pi/22).
%C The ratio of the perimeter of a regular 11-gon (hendecagon) to its diameter (largest diagonal).
%C Also least positive root of x^5 - 11x^4 - 484x^3 + 3993x^2 + 43923x - 161051.
%e 3.130926442012273089763438709560132713403129944771655225197821304298120771...
%p evalf(22*sin(Pi/22),100); # _Wesley Ivan Hurt_, Feb 01 2017
%t RealDigits[22*Sin[Pi/22], 10, 120][[1]] (* _Amiram Eldar_, Jun 26 2023 *)
%o (PARI) 22*sin(Pi/22)
%Y Cf. For other n-gons: A010466 (n=4), 10*A019827 (n=5, 10), A280533 (n=7), A280585 (n=8), A280633 (n=9), A280819 (n=12).
%K nonn,cons
%O 1,1
%A _Rick L. Shepherd_, Jan 07 2017