Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 255: | \[{20^{255}-1\over19}\] | 11 × 31 × 61 × 251 × 421 × 3001 × 3061 × 60589 × 70891 × 126481 × 261451 × 2230061 × 455851601 × 18510970711<11> × 36372797968360681<17> × 126433576549825993751<21> × 689852631578947368421<21> × 2025046074983629951481<22> × 540279704259122547163922701<27> × 2200293635138152581356053802893789<34> × 23303135002185020696981531258045152009458141181<47> × 317257586379935111284495781918150019632865513166536697695987823413982590749322870871<84> |