Factor-multiple Chains
If you haven't already had a look, it might be worth investigating
this
spreadsheet which you can put different numbers into to make
chains.
For the smallest chain, what number might it be a good idea to
start with on the left?
What could you try first to make the largest chain? You could
choose to start with a particular number on the right this
time.
How will you know which numbers you have already tried?