A393780 Decimal expansion of cos(1/3).

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

Offset

0,1

Links

Table of n, a(n) for n=0..115.

Index entries for transcendental numbers.

Example

0.9449569463147376643882840076758806...

Mathematica

First[RealDigits[Cos[1/3], 10, 100]] (* Paolo Xausa, Mar 01 2026 *)

Prog

(PARI) cos(1/3) \\ Charles R Greathouse IV, Apr 24 2026

Crossrefs

Cf. A393781 (sin(1/3)), A161012 (tan(1/3)).

Sequence in context: A374225 A397161 A199179 * A344949 A300072 A393950

Adjacent sequences: A393777 A393778 A393779 * A393781 A393782 A393783

Keyword

nonn,cons,easy

Author

R. J. Mathar, Feb 27 2026

Status

approved