12121...12121 (627-digits)
This number is a prime.
The smallest prime formed by alternating ones and twos with a composite number of digits. [Gallardo]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell
This number is a prime.
The smallest prime formed by alternating ones and twos with a composite number of digits. [Gallardo]