It is used to determine all prime numbers less than or equal to N. By definition, a number x is prime if and only if it has exactly two divisors. The number 2 is the first prime number and is the only even prime number.
Try for N=
Code
This card features the Sieve of Eratosthenes (C++), optimized based on the progress made.
Graphical view
This card shows how the Sieve of Eratosthenes processes each prime number by removing its multiples, starting from 2.
Viewing prime numbers
This card shows the final output of the Sieve of Eratosthenes.