1-digit prime factors: 3
2-digit prime factors: 3
3-digit prime factors: 5
4-digit prime factors: 14
5-digit prime factors: 32
6-digit prime factors: 74
7-digit prime factors: 151
8-digit prime factors: 356
9-digit prime factors: 707
10-digit prime factors: 1400
11-digit prime factors: 2811
12-digit prime factors: 5397
13-digit prime factors: 10568
Number of known prime numbers: 21521 (258021 digits)
Perl script written by Dario Alejandro Alpern. Last updated on May 25th, 2015.