Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 240: | \[{7^{240}-1\over6}\] | 26 × 3 × 53 × 11 × 13 × 17 × 19 × 31 × 41 × 43 × 61 × 73 × 181 × 191 × 193 × 241 × 281 × 409 × 881 × 1201 × 2801 × 4021 × 159871 × 169553 × 542081 × 6568801 × 12913561 × 555915824341<12> × 810221830361<12> × 33232924804801<14> × 2312581841562813841<19> × 5789644155060072001<19> × 85560261859655897641<20> × 874189773856249734968757238372561<33> |