71111...11111 (56-digits)
This number is a prime.
711111 1111111111 1111111111 1111111111 1111111111 1111111111
The largest known prime of the form 7(1)k.
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell
This number is a prime.
711111 1111111111 1111111111 1111111111 1111111111 1111111111
The largest known prime of the form 7(1)k.