It can’t happen. The numbers themselves don’t really mean much and the pid is “just” a reference to an internal data structure.
Actually the firs number has some meaning, if it is 0 then it is a pid referring to a process on this node, otherwise it refers to a process on another node.
A bit of ancient history. Back in the really old days the other numbers did mean something: the 2nd number was the index into the process table of that process and the 3rd was the number of times this index had been used. No risk of reuse then either.
