Base 8 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 155: | \[{8^{155}-1\over7}\] | 312 × 151 × 311 × 2791 × 11471 × 73471 × 103231 × 2147483647 × 4649919401<10> × 18158209813151<14> × 658812288653553079<18> × 10396616065733554034660553056477704365402928208212077833242118911<65> |