Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 267: | \[{3^{267}-1\over2}\] | 13 × 179 × 850666273 × 1611479891519807<16> × 5042939439565996049162197<25> × 2270061722000879968839976583683542421<37> × 337165483055999474909532425685921831037<39> |