This number is a composite.

+ 75361 = 11 * 13 * 17 * 31 is the first 4-brilliant Carmichael number. Note that both its digital sum and reversal are semiprime. [Carmichael]

(There is one curio for this number that has not yet been approved by an editor.)

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