Base 8 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 263: | \[{8^{263}-1\over7}\] | 23671 × 5609685181351<13> × 13572264529177<14> × 274473195338134592222791<24> × 585608533119706764820561<24> × 748093847626791888666559<24> × 120226360536848498024035943<27> × 20389292512407050043445124186439967<35> × 383725126655170964501315730676446647<36> × 2281789702931966351864875967159638003063<40> |