77777...25237 (100-digits)
This number is a prime.
7777777777 7777777777 7777777777
7777777777 7777777777 7777777777 7777777777 7777777777 7777777777 7777525237
The largest prime-digit prime less than a googol containing
all prime digits (2, 3, 5, 7). [Loungrides]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell