# 4369

This number is a composite.

The only base-2 pseudoprime formed entirely from Fermat primes (17*257).

Smaller of the only known base-2 twin pseudoprime. [Gupta]

The smallest base-2 pseudoprime that is a hexadecimal repunit: R4 = 0x1111. The second is R7, and by concatenating them, one has the third, R11. [Yosei]

Printed from the PrimePages <primes.utm.edu> © G. L. Honaker and Chris K. Caldwell