1117315319
This number is a prime.
The smallest prime concatenated from five distinct double-digit primes, so that deleting from the right, a double digit prime each time, remains always a prime, i.e., 11173153, 111731, 1117, 11. [Loungrides]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Reginald McLean