Numeri primi da 2 fino ad N, algortimo numeri primi
What is a Factorial? | Quality Gurus
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
proof writing - Prove for all n∈N $1^2+3^2+5^2+...+(2n-1)^2=\frac{4n^3-n}{3}$ - Mathematics Stack Exchange
Sum of n, n², or n³ | Brilliant Math & Science Wiki