Problem
Problem of the Day #33 (Challenge)
POTD Challenge December 22, 2023
Let a_n = 1-\frac{2n^2}{1+\sqrt{1+4n^4}} for all n \in \mathbb{Z}^+.
Find the value of \sqrt{a_1}+2\sqrt{a_2}+...+20\sqrt{a_{20}}.
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