Base 8 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 140: | \[{8^{140}-1\over7}\] | 32 × 52 × 7 × 11 × 13 × 29 × 31 × 41 × 43 × 61 × 71 × 113 × 127 × 151 × 211 × 281 × 331 × 337 × 421 × 1321 × 1429 × 5419 × 14449 × 29191 × 86171 × 106681 × 122921 × 152041 × 664441 × 1564921 × 7416361 × 47392381 × 146919792181<12> × 1041815865690181<16> |