Real Vim ninjas count every keystroke - do you?

Pick a challenge, fire up Vim, and show us what you got.

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$ gem install vimgolf
$ vimgolf setup
$ vimgolf put 51459ef6b94aa50002000002

It's a factor

Flaunt your macro prowess by factoring some numbers. Too hard? It takes less than 30 strokes, I promise.

Start file

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20

End file

1
1 2
1 3
1 2 4
1 5
1 2 3 6
1 7
1 2 4 8
1 3 9
1 2 5 10
1 11
1 2 3 4 6 12
1 13
1 2 7 14
1 3 5 15
1 2 4 8 16
1 17
1 2 3 6 9 18
1 19
1 2 4 5 10 20

View Diff

2,20c2,20
< 2
< 3
< 4
< 5
< 6
< 7
< 8
< 9
< 10
< 11
< 12
< 13
< 14
< 15
< 16
< 17
< 18
< 19
< 20
---
> 1 2
> 1 3
> 1 2 4
> 1 5
> 1 2 3 6
> 1 7
> 1 2 4 8
> 1 3 9
> 1 2 5 10
> 1 11
> 1 2 3 4 6 12
> 1 13
> 1 2 7 14
> 1 3 5 15
> 1 2 4 8 16
> 1 17
> 1 2 3 6 9 18
> 1 19
> 1 2 4 5 10 20

Solutions by @zulolosi:

Created by: @udioica Tweet

38 active golfers, 104 entries

Solutions by @zulolosi: