11111

This number is a composite.

+ The prime factors of the 5-digit repunit 11111 are the only ones with a period length of 5. [Honaker]

+ Largest known repunit number R such that R+2, R+6, R+8 are near repunit primes. [Gupta]

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