Numeri primi da 2 fino ad N, algortimo numeri primi
summation - Is there any. elementary formula for the sequence$\sum_{k=1}^{n }\left(2k-1\right)\left(\frac{1}{2}\right)^{k}$ - Mathematics Stack Exchange
Sum of n, n², or n³ | Brilliant Math & Science Wiki
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Proof that ∑2^(n-1) = 2^n - 1 with Mathematical Induction - YouTube
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Question 10 - Find sum of series, nth terms is (2n - 1)2
Prove that the sum from 1 to ∞ of (2n + 1) / (n2(n+1)2) = 1 - Stumbling Robot