This number is a prime.

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

+ The reversal of the 239th prime number (1499) is the 239th emirp (9941). [Gaydos]

+ The 52nd prime number (239) has a Collatz trajectory length of 52. [Gaydos]

+ The smallest integer greater than 1 that has the same Collatz trajectory length (52) as its square (57121). [Gaydos]

(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