222333555557777777
This number is a prime.
22233355 5557777777
The only prime formed by a prime digit n, (n=2), followed by d times each prime digit d. [Loungrides]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell
This number is a prime.
22233355 5557777777
The only prime formed by a prime digit n, (n=2), followed by d times each prime digit d. [Loungrides]