17777...77771 (49-digits)

This number is a prime.

                       177777777 7777777777 7777777777 7777777777 7777777771

Just showing those entries submitted by 'Loungrides': (Click here to show all)

+ The only square-congruent plateau prime of order 7. [Loungrides]

Printed from the PrimePages <primes.utm.edu> © G. L. Honaker and Chris K. Caldwell