858

This number is a composite.

+ 858 = 2 * 3 * 11 * 13 is the smallest palindrome with 4 distinct prime factors. Note that the reversal of each is prime. [Post]

+ Smallest palindromic prime p such that p-1, p+1, p-5, and p+5 are all primes. [Sariyar]

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