4

This number is a composite.

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The 4th prime that gives primes in translation twice from bases 2 and 3 to base 10 is the first to do it once from base 4. The 44th is the first to do it twice, and both begin with 234 in base ten (234099253 and 2348568403). [Merickel]

In Roman numerals, the number of 4-digit primes in decimal with all distinct digits is D. [Merickel]