# Mathematician:John Lewis Selfridge

## Mathematician

American mathematician who contributed to the fields of analytic number theory, computational number theory and combinatorics.

Proved in $1962$ that $78 \ 557$ is a Sierpiński number of the second kind.

Conjectured (with Wacław Franciszek Sierpiński) that it is also the smallest. This still has not been proven (see Sierpiński Problem).

American

## History

• Born: February 17, 1927, Ketchikan, Alaska, United States
• Died: October 31, 2010, DeKalb, Illinois