A178809 Decimal expansion of the area of the regular 12-gon (dodecagon) of edge length 1.

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

Offset: 2

Author

Vladimir Joseph Stephan Orlovsky, Jun 16 2010

Keywords

• cons
• nonn
• easy

Comments

Surface area of a regular hexagonal prism with unit side length and height. - Wesley Ivan Hurt, May 04 2021

Examples

			11.196152422706631880582339024517617100828415761431141884167420938355...
		

Links

• G. C. Greubel, Table of n, a(n) for n = 2..10000
• Index entries for algebraic numbers, degree 2

Crossrefs

Cf. A010482, A090488, A104956, A120011, A176532.

Programs

Mathematica

RealDigits[N[6+3*Sqrt[3],150]][[1]]

PARI

sqrt(27)+6 \\ Charles R Greathouse IV, Apr 25 2016

Formula

Equals 6+3*sqrt(3).

Equals 1 + A176532 = 6 + A010482. - R. J. Mathar, Jun 25 2010

Extensions

Offset corrected and keyword:cons inserted by R. J. Mathar, Jun 25 2010