# Mathematician:Horace Scudder Uhler

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## Mathematician

American physicist who worked on geometrical optics, spectroscopy and X-rays.

As a mathematician, demonstrated several Mersenne numbers to be composite without finding one single Mersenne prime.

Also calculated the values of many irrational numbers such as logarithms, reciprocals and roots to a colosssal number of decimal places.

Published the value of $\map {\log_{10} } {9^{9^9} }$ to $250$ decimal places in $1947$.

Apparently he found such work relaxing.

## Nationality

American

## History

- Born: August 5, 1872 in Baltimore, USA
- Died: December 6, 1956

## Theorems and Definitions

## Publications

- 1907:
*Atlas of Absorption Spectra*

- 1946:
*Note on the Mersenne numbers $M_{157}$ and $M_{167}$*(*Bull. Amer. Math. Soc.***Vol. 52**,*no. 2*: p. 178)

## Sources

- April 1953: Adrian Struyk:
*Mathematical Miscellanea*(*The Mathematics Teacher***Vol. 46**,*no. 4*: pp. 265 – 273) www.jstor.org/stable/27954274

- 1986: David Wells:
*Curious and Interesting Numbers*... (previous) ... (next): $9^{9^9}$ - 1997: David Wells:
*Curious and Interesting Numbers*(2nd ed.) ... (previous) ... (next): $9^{9^9}$