28141721
This number is a prime.
The smallest prime obtained by concatenating the positive
multiples of 7 right and left of 1. [Loungrides]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell
This number is a prime.
The smallest prime obtained by concatenating the positive
multiples of 7 right and left of 1. [Loungrides]