13931...13931 (185-digits)

This number is a prime.

                           13931 3931393139 3139313931 3931393139 3139313931
3931393139 3139313931 3931393139 3139313931 3931393139 3139313931 3931393139
3139313931 3931393139 3139313931 3931393139 3139313931 3931393139 3139313931

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

A palindromic prime with all substrings of five consecutive digits forming primes as well. [Patterson]