Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 480: | \[{7^{480}-1\over6}\] | 27 × 3 × 53 × 11 × 13 × 17 × 19 × 31 × 41 × 43 × 61 × 73 × 97 × 181 × 191 × 193 × 241 × 281 × 353 × 409 × 881 × 1201 × 2801 × 4021 × 159871 × 169553 × 542081 × 6568801 × 12913561 × 38470561 × 104837857 × 8442444961<10> × 47072139617<11> × 555915824341<12> × 810221830361<12> × 33232924804801<14> × 102118777045028801<18> × 108604397663266369<18> × 2312581841562813841<19> × 5789644155060072001<19> × 85560261859655897641<20> × 310484866091676781304919233441<30> × 874189773856249734968757238372561<33> × 176230423067090512860333385365302814613666094467468835315796073738026651857920999861477392757235041<99> |