Pietro Antonio Cataldi
Pietro Antonio Cataldi (April 15, 1548 – February 11, 1626) was an Italian mathematician. A citizen of Bologna, he taught mathematics and astronomy and also worked on military problems. His work included the development of continued fractions and a method for their representation. He was one of many mathematicians who attempted to prove Euclid's fifth postulate. Cataldi discovered the sixth and seventh Mersenne primes by 1588. He held the record for the largest known prime for almost two centuries, until Leonhard Euler discovered that 231 - 1 was the eighth Mersenne prime.
1. ^ a b Caldwell, Chris. The largest known prime by year.
* O'Connor, John J.; Robertson, Edmund F., "Pietro Cataldi", MacTutor History of Mathematics archive, University of St Andrews, http://www-history.mcs.st-andrews.ac.uk/Biographies/Cataldi.html .
* Galileo Project
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