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%I #10 Feb 26 2023 19:26:32
%S 1,5,3,6,1,7,9,1,8,7,2,4,0,3,7,2,2,3,4,7,6,2,7,2,5,1,3,5,8,7,7,4,4,0,
%T 1,4,6,9,0,2,9,4,8,0,4,8,1,2,5,4,2,2,3,2,7,3,4,4,4,3,2,7,2,0,2,1,1,5,
%U 6,3,1,2,7,0,9,9,9,3,1,7,1,9,0,9,0,7
%N Decimal expansion of the kelvin-kilogram relationship (k/c^2) according to the 2019 SI system in units kg.
%C Since the Boltzmann constant k in the 2019 SI system is equal to 1.380649×10^(-23) J/K (see A070063) and given the fact that c = 299792458 m/s is also exact according to the same system (see A003678), it follows that k/c^2 is a rational number.
%C For the (inverse) kilogram/kelvin relationship in kelvin units, c^2/k = 6.509657260...*10^39 K, see links.
%H NIST Physics Laboratory, <a href="https://physics.nist.gov/cgi-bin/cuu/CCValue?kkg">kelvin-kilogram relationship</a>
%H NIST Physics Laboratory, <a href="https://physics.nist.gov/cgi-bin/cuu/CCValue?kgk">kilogram-kelvin relationship</a>
%F a(n) = A070063 / A003678^2.
%F k/c^2 = (1.380649*10^(-23))/299792458^2 = 18913/123117147772166800000000000000000000000000000 kg.
%e 1.536179187240372234762...*10^(-40) (rational number).
%Y Cf. A003678, A070063.
%K cons,easy,nonn
%O -39,2
%A _Marco Ripà_, Jan 31 2023
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