4139
This number is a prime.
The only prime derived from a double-digit composite number by inserting the sum of its digits in-between. [Loungrides]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell
This number is a prime.
The only prime derived from a double-digit composite number by inserting the sum of its digits in-between. [Loungrides]