Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 319: | \[{3^{319}-1\over2}\] | 23 × 59 × 3191 × 3851 × 28537 × 20381027 × 113164935467<12> × 26425387421490471188793734763177943613329<41> × 2742852582186302944625818325876362221386271693831170052360109818510078843584437<79> |