This number is a prime.

                                                                6 6132153133

+ 66132153133 is prime and the start of a run of four more primes obtained by the following transformation rule for each digit: d -> d digits d. The fifth such prime has 3560 digits. By Giovanni Resta. [Rivera]

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