1409

This number is a prime.

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Each of the states North Dakota, Rhode Island, and Wyoming have just one area code for the state and they are 701, 401, 307, respectively, and each is a prime. Curiously, the sum of the three codes is an emirp (which happens to be a twin prime). [Green]

Submitted: 2014-04-05 18:40:03; Last Modified: 2018-12-26 16:24:45.