9907
This number is a prime.
The largest 4-digit prime number such that its sum of digits is a square, i.e., 9+9+0+7 = 25 = 5^2. [Ikemoto]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell
This number is a prime.
The largest 4-digit prime number such that its sum of digits is a square, i.e., 9+9+0+7 = 25 = 5^2. [Ikemoto]