Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 62: | \[{20^{62}-1\over19}\] | 3 × 7 × 311 × 11161 × 40487 × 75269 × 1646101 × 340037881769<12> × 581740080393079<15> × 335566676799518320433573040127<30> |