# 5555

This number is a composite.

The sum of the 9th + 18th + 27th + ..... + 135th prime. [Bopardikar]

5555^{n} + 162 is prime for *n* = 0 to 7. [Blanchette]

The decimal part of 5555^{1/3} starts with the reversal of
its integer part (which happens to be an emirp), i.e., 17.71.... [De Geest]

The 2nd repdigit number consisting of 5’s whose the product with all its truncations plus 2 is prime, i.e., 5555*555*55*5+2=847831877. The previous such prime is 55*5+2=277 and the next is 55555555*5555555*…*5+2. [Loungrides]

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