Algorithms on prime numbers.

Good Morning
I created these three algorithms, I would like your opinion.

albericolepore.altervista.org/crivello-lepore/

and

albericolepore.altervista.org/test-fattorizzazione-primalita-lepore/

and

albericolepore.altervista.org/come-calcolare-numero-successivo/

I apologize but I do not speak English