[quote=@Webmaster]
<Snipped quote by Balance>

7-6
13-12
19-18
25-24
[/quote]

Right. Although 25 doesn't produce the effect. Hmm...
7-6
13-12
19-18
25-24
31-30
37-36
43-42
49-48
Squares...
55-54
Never mind.
61-60
67-66
73-72
79-78
85-84
I wonder if there's a pattern. TIME TO FIND OUT. (after I finish figuring out if all of the cycles of x/7 have a similar prime factorisation)