Base 8 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 420: | \[{8^{420}-1\over7}\] | 33 × 52 × 7 × 11 × 13 × 19 × 29 × 31 × 37 × 41 × 43 × 61 × 71 × 73 × 109 × 113 × 127 × 151 × 181 × 211 × 281 × 331 × 337 × 421 × 631 × 1321 × 1429 × 2521 × 5419 × 14449 × 23311 × 29191 × 54001 × 86171 × 92737 × 106681 × 122921 × 152041 × 649657 × 664441 × 870031 × 983431 × 1564921 × 1711081 × 1765891 × 7416361 × 18837001 × 29247661 × 47392381 × 430839361 × 40388473189<11> × 77158673929<11> × 118750098349<12> × 146919792181<12> × 1041815865690181<16> × 17369459529909057773233442461<29> × 29728307155963706810228435378401<32> × 11247702599676505481447137991664348691<38> × 15169173997557864184867895400813639018421<41> |