Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 397: | \[{3^{397}-1\over2}\] | 366829 × 2233523 × 163396728220907574918050165329759467394476719555940685707819382394752434296939<78> × 9759120510732199972181830889270079954038622589481867398458495622001921330050681686958393271650697437<100> |