1513
This number is a composite.
151^3 + 15^13 + 1^513 is an emirp. [Patterson]
π(1513) = (1*5*1*3)^1 + (1*5*1*3)^2. [Lotfi]
The only brilliant number concatenated in reverse order from two successive double-digit odd numbers, i.e., 1513 = 17 × 89. [Loungrides]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell