# Mathematician:Donald Bruce Gillies

## Mathematician

In $1963$, discovered the $21$st, $22$nd and $23$rd Mersenne primes with the aid of the ILLIAC II computer. The largest of these ($2^{11 \, 213} - 1$) was reported in the Guinness Book of Records and immortalised on all mail sent from the postroom of the University of Illinois.

## History

• Born: October 15, 1928
• Died: July 17, 1975