This number is a composite.

+ 338 (base 10) = 101010010 (base 2). Read backwards, 010010101 (base 10) is prime. [Henderson]

+ The least integer for which the number of divisors and the sum of its prime factors are both perfect numbers. [Post]

(There are 2 curios for this number that have not yet been approved by an editor.)

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