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

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.[2]

Sources

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