Largest known Wagstaff prime

The largest known  is equal to (283,339 + 1) / 3, which is 25,088 digits long; it has been discovered on September 17, 2014.

The largest known Wagstaff probable prime is equal to (213,372,531 + 1) / 3, which is 4,025,533 digits long; it has been discovered in September 2013.