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The primes 3, 7, 109, and 673, are quite remarkable. By taking any two primes and concatenating them in any order the result will always be prime. For example, taking 7 and 109, both 7109 and 1097 are prime. The sum of these four primes, 792, represents the lowest sum for a set of four primes with this property. (Project Euler, Problem 60)


  Submitted: 2013-03-28 09:26:27;   Last Modified: 2013-03-29 09:26:14.

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