7879

This number is a prime.

+ The first emirp encountered in the decimal expansion of ii, where i is the square root of -1. [Beedassy]

+ The smallest emirp formed from the last three digits. [Loungrides]

+ The larger prime in the largest twin prime pair (7877, 7879) formed by using three consecutive double-digit numbers, i.e., 77, 78, 79. [Loungrides]

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