A019697 Decimal expansion of 2*Pi/11.

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

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn
• cons

Comments

The famous rose window of the Troia cathedral in Apulia, Italy, consists of eleven columns that radiate from the center with unusual angles 2Pi/11 = 32.72... °. - Jean-François Alcover, May 25 2015

Links

• Ivan Panchenko, Table of n, a(n) for n = 0..1000
• Wikipedia, Troia Cathedral
• Index entries for transcendental numbers

Crossrefs

Equals twice A019678.

Programs

Mathematica

RealDigits[(2Pi)/11,10,120][[1]] (* Harvey P. Dale, Apr 20 2013 *)

PARI

2*Pi/11 \\ Charles R Greathouse IV, Oct 01 2022