A365163 Length of the perimeter of the regular heptagon with unit circumradius.

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

Offset

1,1

Links

Table of n, a(n) for n=1..92.

Index entries for algebraic numbers, degree 6.

Formula

Equals 7*A272487.

Minimal polynomial x^6-343*x^4+33614*x^2-823543 . - R. J. Mathar, Jun 03 2026

Example

6.0743723476458136866607566598...

Mathematica

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 *)

Prog

(PARI) 14*sin(Pi/7) \\ Charles R Greathouse IV, Apr 30 2026

Crossrefs

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

Sequence in context: A382555 A273413 A341906 * A195432 A196915 A374407

Adjacent sequences: A365160 A365161 A365162 * A365164 A365165 A365166

Keyword

nonn,cons

Author

R. J. Mathar, Aug 24 2023

Status

approved