This number is a composite.
The only brilliant number formed from the concatenation of two successive double-digit primes, (2923 = 37 × 79). Note that both the concatenations of its prime factors, i.e., 3779 and 7937, are primes. [Loungrides]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell