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#include <stdio.h> #include <stdlib.h> #include <math.h> unsigned int primordial(unsigned int x); int is_prime(unsigned int x); int main(int argc, char *argv[]) { unsigned int x; if(argc < 2) { puts("Please specify a primordial."); return EXIT_FAILURE; } sscanf(argv[1], "%u", &x); printf("%u\n", primordial(x)); return EXIT_SUCCESS; } unsigned int primordial(unsigned int x) { unsigned int count = 0, product = 1; while(x > 1) { if(is_prime(x)) product *= x; x--; } return product; } int is_prime(unsigned int x) { int i = 2; if(x < 2) return 0; for(; i*i <= x; i++) { if(!(x % i)) return 0; } return 1; }
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