Problem
Problem of the Day #4
POTD November 23, 2023
Author: munch
Let f: \mathbb{Z}^+ \rightarrow \mathbb{Z}^+ such that f(x) is the units digit of x^{(x+1)^{(x+2)^{(x+3)}}}. Find \sum_{x=1}^{100} f(x).
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