Base 8 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 260: | \[{8^{260}-1\over7}\] | 32 × 52 × 11 × 132 × 31 × 41 × 53 × 61 × 79 × 131 × 151 × 157 × 313 × 331 × 521 × 1249 × 1321 × 1613 × 2341 × 2731 × 3121 × 8191 × 21841 × 51481 × 107251 × 121369 × 409891 × 468781 × 7623851 × 22366891 × 34110701 × 723447661 × 108140989558681<15> × 145295143558111<15> × 8925278993793241<16> × 571403921126076957182161<24> × 720453772427518446437641<24> × 134304196845099262572814573351<30> |