Freiman's Constant

The end of the last gap in the Lagrange Spectrum, given by

$$F\equiv {2221564096+283748\sqrt{462}\over 491993569}=4.5278295661\ldots.$$

Real Numbers greater than $F$ are members of the Markov Spectrum.

See also Lagrange Spectrum, Markov Spectrum

References

Conway, J. H. and Guy, R. K. The Book of Numbers. New York: Springer-Verlag, pp. 188-189, 1996.