Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 111: | \[{20^{111}-1\over19}\] | 421 × 65269 × 2889957151 × 40600782778641592009<20> × 383493384240205993228059557962159<33> × 768714606845763128001167284536739<33> × 143759993025672204517453984936257853699831<42> |