11111161111111111111111
This number is a prime.
111 1116111111 1111111111
The only near-repunit prime whose sum and product of digits
are perfect numbers. [Loungrides]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell
This number is a prime.
111 1116111111 1111111111
The only near-repunit prime whose sum and product of digits
are perfect numbers. [Loungrides]