Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 222: | \[{20^{222}-1\over19}\] | 32 × 7 × 127 × 149 × 223 × 421 × 3109 × 17761 × 65269 × 368447 × 2889957151 × 1276660717789<13> × 9609038940231949<16> × 40600782778641592009<20> × 133654159379700086443<21> × 5877924246300529201249<22> × 124065005275823894023123<24> × 401439169151556641763127105201<30> × 383493384240205993228059557962159<33> × 768714606845763128001167284536739<33> × 143759993025672204517453984936257853699831<42> |