13171...91713 (78-digits)

This number is a prime.

                                                                    13171923
2931374143 4753596167 7173798389 9789837973 7167615953 4743413731 2923191713

+ Formed by ascending and descending concatenation of all the non-palidromic two-digit primes. [Silva]

Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell