This number is a composite.

+ n x 2n + 1 is a Cullen prime if n = 141. The largest known case if n is palindromic.

+ A lucky number indexed by a prime number. [De Geest]

(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