This number is a composite.

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

+ 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 <primes.utm.edu> © G. L. Honaker and Chris K. Caldwell