A028999 Binary expansion of arctan(1/2)/Pi.

0, 0, 1, 0, 0, 1, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 1, 1, 0, 1, 1, 0, 0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 0, 1, 1, 1, 0

Offset

0,1

Links

Table of n, a(n) for n=0..98.

Simon Plouffe, The Computation of Certain Numbers Using a Ruler and Compass, J. Integer Seq., Vol. 1 (1998), Article 98.1.3.

Mathematica

Join[{0, 0}, RealDigits[ArcTan[1/2]/Pi, 2, 120][[1]]] (* Amiram Eldar, May 22 2023 *)

Crossrefs

Cf. A004715, A086203.

Sequence in context: A349317 A154103 A116178 * A091244 A189632 A364251

Adjacent sequences: A028996 A028997 A028998 * A029000 A029001 A029002

Keyword

nonn,cons,base

Author

N. J. A. Sloane, Simon Plouffe

Status

approved