

The results, for which he received a standing ovation, were equal: the result of 20 years of Sunday afternoons spent to find the factors of the Mersenne number M67.

In October 1903, Frederick Nelson Cole presented to the American Mathematical Society a talk called 'On the Factorization of Large Numbers'. One of my favourite mathematician stories concerns the days long before sieving Mersenne numbers for big primes became a routine effort via GIMPS (the Great Internet Mersenne Prime Search).
