Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 170: | \[{20^{170}-1\over19}\] | 3 × 7 × 11 × 61 × 251 × 1361 × 5101 × 152381 × 2230061 × 2567783 × 2640509 × 92054423 × 455851601 × 18510970711<11> × 45251724385781<14> × 36372797968360681<17> × 126433576549825993751<21> × 689852631578947368421<21> × 2025046074983629951481<22> × 616538645269540162160455855390419188413152562932920852276721781<63> |