A393783 - OEIS

%I #10 May 18 2026 12:46:42

%S 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,

%T 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,

%U 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

%N Decimal expansion of sin(1/4).

%H <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>.

%F Equals A161013 * A393782.

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

%e 0.2474039592545229295968487048493...

%t First[RealDigits[Sin[1/4], 10, 100]] (* _Paolo Xausa_, Mar 01 2026 *)

%o (PARI) sin(1/4) \\ _Charles R Greathouse IV_, May 18 2026

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

%K nonn,cons,easy

%O 0,1

%A _R. J. Mathar_, Feb 27 2026