623
This number is a composite.
66 + 22 + 33 is prime. [Homewood]
The largest 3-digit number n such that 2^n-n^2 is prime. [Loungrides]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell
This number is a composite.
66 + 22 + 33 is prime. [Homewood]
The largest 3-digit number n such that 2^n-n^2 is prime. [Loungrides]