21111...11113 (25-digits)
This number is a prime.
21111 1111111111 1111111113
Inserting twenty three 1's between the digits of the prime 23 we find another prime whose the product and the sum of digits are consecutive perfect numbers. [Loungrides]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell