21122...51257 (27-digits)

This number is a prime.

                                               2112232 2722923323 9241251257

+ 211223227229233239241251257 is the smallest prime formed by concatenation of nine increasing consecutive primes (211,223,227,229,233,239,241,251,257). [Mortreuil]

Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell