A005601 - OEIS

A005601

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

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

(list; constant; graph; refs; listen; history; text; internal format)

OFFSET

4,2

COMMENTS

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-François Alcover, Jul 27 2016

REFERENCES

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

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

NIST, 2022 CODATA recommended values (see NIST link).

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

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

LINKS

Table of n, a(n) for n=4..13.

E. R. Cohen and B. N. Taylor, The 1986 adjustment of the fundamental physical constants, Rev. Modern Phys., 59 (1987), 1121-1148.

Friedrich Lenz, The Ratio of Proton and Electron Masses, Phys. Rev. 82, 554 - Published 15 May 1951.

NIST, Proton-electron mass ratio, viewed May 14 2024.

EXAMPLE

1836.15...

CROSSREFS

Cf. A003677.

Sequence in context: A171043 A124599 A365959 * A321098 A308741 A304580

Adjacent sequences: A005598 A005599 A005600 * A005602 A005603 A005604

KEYWORD

cons,nonn,nice,hard

AUTHOR

N. J. A. Sloane

EXTENSIONS

Updated by Ivan Panchenko, May 29 2019

Updated using current NIST CODATA value. - Harvey P. Dale, May 20 2023

STATUS

approved