9547
This number is a prime.
The largest 4-digit distinct-digit prime (emirp) abcd such that a^a+b^b+c^c+d^d is prime, i.e., 9^9+5^5+4^4+7^7 = 388247413. [Loungrides]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell
This number is a prime.
The largest 4-digit distinct-digit prime (emirp) abcd such that a^a+b^b+c^c+d^d is prime, i.e., 9^9+5^5+4^4+7^7 = 388247413. [Loungrides]