72727...72727 (99-digits)
This number is a prime.
727272727 2727272727 2727272727
2727272727 2727272727 2727272727 2727272727 2727272727 2727272727 2727272727
7+720*(100^49-1)/99 is a 99-digit wondrous undulating
prime. [Tobias]
Printed from the PrimePages <primes.utm.edu> © G. L. Honaker and Chris K. Caldwell