There is significant ambiguity here (admittedly, that's what often makes math puzzles interesting!).
"Numbers to be used: ..." could be interpreted as ALL of these (sequences of digits) must be used at least once,
but then adding
"only" carries an implication that the solution is exclusive to those within that given sequence, and not that they all necessarily be utilised.
Also, it is not clear if the solution can include functions such as logn or power^(1/n)
So, possibly there is a whole raft of solutions, limited only by ones imagination.