cunningham chains! some small programs to find cunningham chains, each version will improve upon the previous one versions so far: 01 - find chains by stupid brute force 02 - use simple sieve to eliminate composite numbers with small prime factors 03 - multiply origin by primorial to increase number of primes in sieve 04 - use strategy that minimizes the number of primality tests warning, external dependencies: gmp (gnu multiprecision library)