This number is a composite.

Just showing those entries submitted by 'Silva': (Click here to show all)

+ 27^27 + (2*7)^(2*7) is prime. [Silva]

+ The sum of all composite digits (4+6+8+9) equals the first odd prime cubed. [Silva]

(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