8623
This number is a prime.
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]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell