A393783 Decimal expansion of sin(1/4).

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

Offset

0,1

Links

Table of n, a(n) for n=0..116.

Index entries for transcendental numbers.

Formula

Equals A161013 * A393782.

Equals sqrt((1-A201505)/2).

Example

0.2474039592545229295968487048493...

Mathematica

First[RealDigits[Sin[1/4], 10, 100]] (* Paolo Xausa, Mar 01 2026 *)

Prog

(PARI) sin(1/4) \\ Charles R Greathouse IV, May 18 2026

Crossrefs

Cf. A393782 (cos(1/4)), A161013 (tan(1/4)).

Sequence in context: A078943 A063733 A187089 * A141330 A239324 A373166

Adjacent sequences: A393780 A393781 A393782 * A393784 A393785 A393786

Keyword

nonn,cons,easy

Author

R. J. Mathar, Feb 27 2026

Status

approved