This number is a prime.
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The smallest prime in the only case of four 3-digit primes of forms, 4p+3, 6p+5, 8p+7, 10p+9, where p is a prime, (case p=59), i.e., 239, 359, 479, 599. Note that these forms have the general form kn+(k-1), where k is each of the first four even composite numbers, 4, 6, 8, 10. [Loungrides]