This number is a prime.

+ The smallest invertible prime p containing all of the invertible digits {0, 1, 6, 8, 9} such that (p^n + k) is an emirp, where k is an integer formed by concatenating in ascending order the first n digits, n times each of them, (case n=6), i.e., 1061689^6 + 111111222222333333444444555555666666. [Bajpai]

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