Definition:Fermat Pseudoprime/Base 5/Sequence

Sequence of Fermat Pseudoprimes Base $5$

The sequence of Fermat pseudoprimes base $5$ begins:

$4, 124, 217, 561, 781, 1541, 1729, 1891, 2821, 4123, 5461, 5611, 5662, 5731, 6601, 7449, 7813, 8029, \ldots$

This sequence is A005936 in the On-Line Encyclopedia of Integer Sequences (N. J. A. Sloane (Ed.), 2008).