%I #30 Sep 27 2024 23:00:35
%S 3,2,6,1,2,2,5,5,7,1,7,4,9,4,0,5,5,5,6,7,9,4,1,0,1,8,4,8,3,7,6,3,3,2,
%T 8,2,0,3,0,1,7,9,6,9,9,0,1,7,7,9,2,8,1,2,1,2,3,0,5,1,0,2,4,8,1,0,0,5,
%U 8,2,8,4,3,2,0,9,0,0,1,9,4,1,7,8,0,1,6,1,1,7,7,9,3,4,3,5,7,7,4,7,0,4,1,5,7
%N Decimal expansion of c/P in SI units (meters), where c is the speed of light in vacuum and P is the number of periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom in one second.
%C This is the number of meters in a "light-tick", where "tick" is a single caesium-133 transition, and the term "light-tick" is analogous to the well-known term "light-year" (A213614). - _Robert B Fowler_, Sep 23 2024
%H Wikipedia, <a href="http://en.wikipedia.org/wiki/Second">Second</a>
%F c/P = A003678/A230458 = 299792458/9192631770 = 21413747/656616555.
%F a(n+3060150) = a(n), for n > -1. - _Robert B Fowler_, Sep 01 2024
%F Equals 1/A322579. - _Hugo Pfoertner_, Sep 23 2024
%e 0.0326122557174940555679410184837633282030179699... meters.
%t First[RealDigits[21413747/656616555, 10, 100]] (* _Paolo Xausa_, Sep 27 2024 *)
%Y Cf. A003678, A230436, A230458, A213614, A230845, A322579.
%K nonn,cons
%O -1,1
%A _Omar E. Pol_, Jul 06 2014