Someone

#include <stdio.h>
#include <math.h>

unsigned long long limit = 100000000;
unsigned long long i;
unsigned long long n;

int main() {
	int *is_prime = malloc(1000000001 * sizeof(is_prime));
	for (i = 2;i <= limit;i++) {
		is_prime[i] = 1;
	}

	for (n = 2;n <= sqrt(limit);n++) {
		if (is_prime[n]) {
			for (i = n * n;i <= limit;i += n)
				is_prime[i] = 0;
		}
	}

	for (n = 2;n <= limit;n++) {
		if (is_prime[n]) {
			printf("%d\n", n);
			free(is_prime);
		}
	}
}