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
A palindromic prime with all substrings of five consecutive digits forming primes as well. [Patterson]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell