MathGroup Archive 2006

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series question

Given the series transformation:

b_n  =  Sum[ (a_m)^n , m=0..infinity]

so for example it transforms a_n=n into b_n=zeta(n) and a_n=n^2+3 into
some other series.

Is there a reverse transformation that starting with the series b_n you
can get back to a_n ?

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