I did some calculations myself. I discovered after only a few minutes of boredom and intrigue that a massive amount of computing effort can save these simple rules
1. If at any given time an equivalent has appeared before of an equation that ended with a 1 the that equivalent and all in it are no longer vaild for the end result.
Example:6. Numbers not vaild would be 3,10,5,16,8,4,2,1. If one of these numbers has been reached then stop.
The end goal is not to find if every reaches 1.
Rather it is to find a repeated number. I bet you nearly anything that no equation that has been to reach has repeated the same number.