37573

This number is a prime.

Just showing those entries submitted by 'Loungrides': (Click here to show all)

The larger, of only two prime-digit truncatable palindromic primes, from which deleting each time a digit from each end, always remains a prime, i.e., 37573, 757, 5. The smaller one is 37273. Note that their concatenation in order 3727337573 is also prime. [Loungrides]