13141...14131 (53-digits)

This number is a prime.

                  131 4109531961 7311112121 0103010121 2111137169 1359014131

The bottom row of a palindromic prime pyramid of odd primes(starting with 3) of step size 2 and height 14, where each palindromic prime p is the smallest p containing p in the above row. [Gupta]