How to replace a start of a row

#1

I have a string containing 14 numbers, but can only start with 2 or 5.
How to Implement that?
For examaple.
20 2222 2222 2222 or
50 2222 2222 2222

if field <> 2 than 2 elseif field <> 5 than 5 end.
Thanks

#2

I suggest just generating 1 fewer number and randomly adding 2 or 5 at the start using the f(x) feature:

["2", "5"].sample + this
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