9421

This number is a prime.

Define a strictly non-palindromic number n as a number that's not palindromic in any nontrivial base (from 2 to n-2). The twin prime pair (9419, 9421) has a remarkable property: both primes are strictly non-palindromic. This is just the 4th pair of twin primes with this property, after (137, 139), (4337, 4339), and (8291, 8293). [Keith]