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A005601 Decimal expansion of proton-to-electron mass ratio.
(Formerly M4470)

%I M4470

%S 1,8,3,6,1,5,2,6,7,3

%N Decimal expansion of proton-to-electron mass ratio.

%C Curiously, this ratio coincides with 6*Pi^5 = 1836.1181... up to 5 digits (first noticed in 1952 by Friedrich Lenz in the Physical Review). - _Jean-Fran├žois Alcover_, Jul 27 2016

%D John Barrow, The Constants of Nature, 367pp, Jonathan Cape, 2002.

%D K. R. Lang, Astrophysical Data: Planets and Stars, Springer-Verlag, NY, 1991.

%D Martin J. Rees. Just Six Numbers: the deep forces that shape the universe. Phoenix. 1999

%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

%H E. R. Cohen and B. N. Taylor, <a href="http://physics.nist.gov/cuu/Archive/1986RMP.pdf">The 1986 adjustment of the fundamental physical constants</a>, Rev. Modern Phys., 59 (1987), 1121-1148.

%H Friedrich Lenz, <a href="https://doi.org/10.1103/PhysRev.82.554.2">The Ratio of Proton and Electron Masses</a>, Phys. Rev. 82, 554 - Published 15 May 1951.

%H NIST, <a href="http://physics.nist.gov/cgi-bin/cuu/Value?mpsme">proton-electron mass ratio</a>

%e 1836.15...

%Y Cf. A003677.

%K cons,nonn,nice,hard

%O 4,2

%A _N. J. A. Sloane_.

%E Updated by _Ivan Panchenko_, May 29 2019

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Last modified December 6 21:48 EST 2019. Contains 329809 sequences. (Running on oeis4.)