11111...00001 (100-digits)
This number is a prime.
1111111111 1111111111 1111111111
1111111111 1111111111 1111111111 1111111111 1111111111 1111111111 1101100001
The largest prime less than a googol which contains the digits 0 and 1 only. [Gupta]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell