8623

This number is a prime.

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+ 8623 is the largest 4-digit prime with this property: the digit sum of this prime and the digit sums of the three preceding primes make a set of four distinct primes. In this case the four primes are 8597, 8599, 8609, 8623, with digit sums 29, 31, 23, 19. [Keith]

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