Primecoin (XPM)

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Primecoin is a proof of work cryptocurrency with a unique proof of work algorithm that finds chains of prime numbers. The purpose behind the creation of primecoin was to provide a proof of work system that can also produce useful output instead of simply throwing away the work done, as in the more popular SHA-256 of Scrypt hashing. Primecoin accepts three types of prime number chains – Cunningham Chain of the first kind, Cunningham Chain of the second kind and Bi-twin chain. Some of the largest Cunningham chains have been found by the Primecoin network.