Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 447: | \[{3^{447}-1\over2}\] | 13 × 7451 × 17881 × 177941761 × 46509804063632583432467217805311362636553293639540930405531<59> × 65433289051305652703665317950576539948799062188120913556948520574705901497633467458024310257123083301111965286180812279845547835150862841<137> |