How to make series of variables with indexes?

Соловьев Александр Александрович <[email protected]>
Newsgroups gmane.comp.mathematics.axiom.user
Message-ID <[email protected]> 
Hi, list.

I want to make a series of equations like this

x**2 + 2 =  a2
x**3 + 3 =  a3
etc

How could I construct variable names a1, a2 ...  in a loop?

Thanks.
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