11317379

This number is a prime.

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

The smallest 8-digit prime such that any substring of length 2 (for you know 8 factors into 2 * 2 * 2, hence the 2-digit substrings) yields only distinct primes (11, 13, 31, 17, 73, 37, 79). [De Geest]