Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 76: | \[{28^{76}-1\over27}\] | 5 × 29 × 157 × 10653073 × 21084187 × 4295845129<10> × 47560093775549<14> × 5504044949138999959<19> × 5746048837796495176973<22> × 108044981035496842464510517<27> |