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A005601 Decimal expansion of proton-to-electron mass ratio.
(Formerly M4470)
2
1, 8, 3, 6, 1, 5, 2, 6, 6, 7, 5 (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-Fran├žois 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.

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..14.

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

NIST, proton-electron mass ratio

EXAMPLE

1836.15...

CROSSREFS

Cf. A003677.

Sequence in context: A113476 A171043 A124599 * A321098 A304580 A304583

Adjacent sequences:  A005598 A005599 A005600 * A005602 A005603 A005604

KEYWORD

cons,nonn,nice,hard

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified January 17 22:39 EST 2019. Contains 319251 sequences. (Running on oeis4.)