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Length of the perimeter of the regular heptagon with unit circumradius.
2

%I #13 Aug 24 2023 07:05:15

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

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

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

%N Length of the perimeter of the regular heptagon with unit circumradius.

%F Equals 7*A272487.

%e 6.0743723476458136866607566598...

%t f[R_, s_] := 2*R*s*Sin[Pi/s]; a[n_] := RealDigits[f[1, 7], 10, n][[1]]; a[92] (* _Robert P. P. McKone_, Aug 24 2023 *)

%Y Cf. A019845 (5-gon), A010487 (4-gon), A365164 (8-gon), A365165 (9-gon), A272487 (edge length), A104957 (area).

%K nonn,cons

%O 1,1

%A _R. J. Mathar_, Aug 24 2023