18911...16901 (25-digits)

This number is a prime.

                                                 18911 1869118061 1698116901

+ The smallest invertible prime that is the reverse concatenation of five consecutive invertible primes: (18911, 18691, 18061, 16981, 16901). [Bajpai]

Printed from the PrimePages <primes.utm.edu> © G. L. Honaker and Chris K. Caldwell