3373

This number is a prime.

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3373 is a prime number formed by concatenating the first four terms (digits) of the following sequence, where a(n) is the ending digit that occurs the most among the first 10^n primes. The sequence begins 3, 3, 7, 3, 7, 3, 7, 7, 7, 7, 3, 7, ... . [Honaker]