1979

This number is a prime.

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The smallest prime that remains prime for D = 0 to 3 in 1D9D7D9, producing the following four primes: 1090709, 1191719, 1292729, 1393739. [Rivera]

Submitted: 2019-02-20 13:49:36; Last Modified: 2019-02-27 18:14:00.