86243
This number is a prime.
The only almost-all-even-digits Mersenne exponent that contains all the distinct positive even digits, (M28), i.e., 2^86243-1 is prime. [Loungrides]
(There are 3 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