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1-digit prime factors: 3

2-digit prime factors: 4

3-digit prime factors: 8

4-digit prime factors: 15

5-digit prime factors: 33

6-digit prime factors: 79

7-digit prime factors: 141

8-digit prime factors: 342

9-digit prime factors: 709

10-digit prime factors: 1384

11-digit prime factors: 2856

12-digit prime factors: 5462

13-digit prime factors: 10727

Number of known prime numbers: 21763 (261089 digits)

Perl script written by Dario Alejandro Alpern. Last updated on May 25th, 2015.