A prime number has exactly two factors, itself and one. The first ten prime numbers are \({2}\), \({3}\), \({5}\), \({7}\), \({11}\), \({13}\), \({17}\), \({19 ...

A prime number has exactly two factors, itself and one. The first ten prime numbers are \({2}\), \({3}\), \({5}\), \({7}\), \({11}\), \({13}\), \({17}\), \({19 ...

These numbers are the rough primes. In this case, you end up with 50 rough primes: 46 of them are actually prime, while the remaining four (121, 143, 169 and 187) are not. Because the rough primes ...