This number is a prime.

+ The largest prime formed from a double-digit prime followed by the sum of its digits. Note that this sum is another prime. [Loungrides]

+ 8311, 83, 11 and the sums of their digits, i.e., 13, 11, 2 are primes. Note that the reversal of the power 83^11 = 1287831418538085836267,, i.e., 7626385808358141387821 is also prime and 8311 is the smallest prime with this property. [Loungrides]

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