Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
85: | \[{20^{85}-1\over19}\] | 11 × 61 × 251 × 2230061 × 455851601 × 18510970711<11> × 36372797968360681<17> × 126433576549825993751<21> × 689852631578947368421<21> × 2025046074983629951481<22> |