1-digit prime factors: 2
2-digit prime factors: 4
3-digit prime factors: 10
4-digit prime factors: 8
5-digit prime factors: 18
6-digit prime factors: 11
7-digit prime factors: 20
8-digit prime factors: 16
9-digit prime factors: 25
10-digit prime factors: 23
11-digit prime factors: 31
12-digit prime factors: 33
13-digit prime factors: 26
14-digit prime factors: 37
15-digit prime factors: 33
16-digit prime factors: 22
17-digit prime factors: 30
18-digit prime factors: 30
19-digit prime factors: 30
20-digit prime factors: 39
21-digit prime factors: 31
22-digit prime factors: 29
23-digit prime factors: 24
24-digit prime factors: 29
25-digit prime factors: 27
26-digit prime factors: 39
27-digit prime factors: 27
28-digit prime factors: 30
29-digit prime factors: 28
30-digit prime factors: 25
31-digit prime factors: 30
32-digit prime factors: 36
33-digit prime factors: 26
34-digit prime factors: 31
35-digit prime factors: 41
36-digit prime factors: 40
37-digit prime factors: 35
38-digit prime factors: 31
39-digit prime factors: 26
40-digit prime factors: 30
41-digit prime factors: 28
42-digit prime factors: 29
43-digit prime factors: 33
44-digit prime factors: 29
45-digit prime factors: 31
46-digit prime factors: 28
47-digit prime factors: 12
48-digit prime factors: 21
49-digit prime factors: 32
50-digit prime factors: 22
51-digit prime factors: 17
52-digit prime factors: 18
53-digit prime factors: 23
54-digit prime factors: 13
55-digit prime factors: 18
56-digit prime factors: 15
57-digit prime factors: 12
58-digit prime factors: 25
59-digit prime factors: 17
60-digit prime factors: 17
61-digit prime factors: 17
62-digit prime factors: 23
63-digit prime factors: 14
64-digit prime factors: 18
65-digit prime factors: 27
66-digit prime factors: 16
67-digit prime factors: 19
68-digit prime factors: 18
69-digit prime factors: 13
70-digit prime factors: 13
71-digit prime factors: 17
72-digit prime factors: 18
73-digit prime factors: 15
74-digit prime factors: 16
75-digit prime factors: 14
76-digit prime factors: 12
77-digit prime factors: 14
78-digit prime factors: 17
79-digit prime factors: 18
80-digit prime factors: 14
81-digit prime factors: 10
82-digit prime factors: 13
83-digit prime factors: 6
84-digit prime factors: 15
85-digit prime factors: 15
86-digit prime factors: 7
87-digit prime factors: 10
88-digit prime factors: 8
89-digit prime factors: 6
90-digit prime factors: 2
91-digit prime factors: 4
92-digit prime factors: 4
93-digit prime factors: 4
94-digit prime factors: 3
95-digit prime factors: 4
96-digit prime factors: 4
97-digit prime factors: 3
98-digit prime factors: 2
99-digit prime factors: 4
104-digit prime factors: 1
105-digit prime factors: 1
106-digit prime factors: 1
116-digit prime factors: 1
128-digit prime factors: 1
225-digit prime factors: 1
Number of known prime numbers: 1966 (81317 digits)
Perl script written by Dario Alejandro Alpern. Last updated on May 25th, 2015.