Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 220: | \[{7^{220}-1\over6}\] | 24 × 53 × 112 × 23 × 191 × 281 × 331 × 661 × 1123 × 1409 × 2311 × 2801 × 2861 × 4021 × 32561 × 38501 × 293459 × 543841 × 2864401 × 10746341 × 83960385389<11> × 7840815905526451<16> × 47045037529563701<17> × 5457586804596062091175455674392801<34> × 17354646292501032302607529755465814241<38> |