# Analytic function problem

#### Siwasq13

##### New member
Suppose f is an analytic function such that f[n](0)=n. Find f(1)
I’m just not quite sure how to approach this problem, I may need a refresher on power/Taylor series, thanks in advance.

#### HallsofIvy

##### Elite Member
Write f as a "MacLaurin series": $$\displaystyle f(x)= f(0)+ f'(0)x+ \frac{f"(0)}{2}x^2+ \cdot\cdot\cdot+ \frac{f^{[n]}(0)}{n!}x^n$$.