It s a 2111...111 number

PFGW Version 1.2.0 for Windows [FFT v23.8]
Primality testing (19*10^53049-1)/9 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 7
Running N+1 test using discriminant 13, base 1+sqrt(13)
Calling N+1 BLS with factored part 0.04% and helper 0.01% (0.13% proof)
(19*10^53049-1)/9 is Fermat and Lucas PRP! (768.3207s+0.0020s)

(19*10^53049-1)/9 is 3-PRP! (140.9960s+0.0023s)
(19*10^53049-1)/9 is 11-PRP! (138.9592s+0.0017s)

To be completed...