74777...77517 (28-digits)

This number is a prime.

74777481 7487748974 9975077517

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The smallest emirp commencing and ending with the digit 7 formed by concatenating seven consecutive primes: {7477, 7481, 7487, 7489, 7499, 7507, 7517}. [Jha]

Submitted: 2018-05-05 19:24:43; Last Modified: 2018-05-05 19:32:22.