Base 13 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 137: | \[{13^{137}-1\over12}\] | 33967064818628105570428371821852312061168411783811040488642021266092993085361339253601985446861169567884880567515689118116178162598657497243307737178361<152> |