1 = 1
2 = 2
3 = 3
4 = 2^2
5 = 3^2
6 = 2 3
7 = 7
8 = 2^3
9 = 3 7
a = 2 3^2
b = b
c = 2^2 3
d = d
e = 2 7
f = 3^3
10 = 2^4
11 = 3^4
12 = 2 3 7
13 = 13
14 = 2^2 3^2
15 = 7^2
16 = 2 b
17 = 3 d
18 = 2^3 3
19 = 19
1a = 2 d
1b = 3^2 7
1c = 2^2 7
1d = 3 b
1e = 2 3^3
1f = 1f
20 = 2^5
21 = 3 1f
22 = 2 3^4
23 = 7 d
24 = 2^2 3 7
25 = 25
26 = 2 13
27 = 3^2 b
28 = 2^3 3^2
29 = 29
2a = 2 7^2
2b = 3 19
2c = 2^2 b
2d = 3^3 7
2e = 2 3 d
2f = 2f
30 = 2^4 3
31 = 7 b
32 = 2 19
33 = 3^5
34 = 2^2 d
35 = 3 13
36 = 2 3^2 7
37 = 37
38 = 2^3 7
39 = 3^2 d
3a = 2 3 b
3b = 3b
3c = 2^2 3^3
3d = 3d
3e = 2 1f
3f = 3 7^2