Base 8 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 139: | \[{8^{139}-1\over7}\] | 5625767248687<13> × 7606017793609<13> × 123876132205208335762278423601<30> × 9121860314802631535729338714627536721870308627534265066967795115502591<70> |