Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 124: | \[{20^{124}-1\over19}\] | 3 × 7 × 311 × 373 × 401 × 11161 × 40487 × 75269 × 1646101 × 340037881769<12> × 111160667194373<15> × 581740080393079<15> × 335566676799518320433573040127<30> × 27736737856153197269675584866568095122351352801389778813467369<62> |