Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 250: | \[{20^{250}-1\over19}\] | 3 × 7 × 11 × 61 × 101 × 151 × 251 × 1451 × 4751 × 57751 × 152381 × 1369801 × 3990001 × 7466201 × 46794901 × 96749251 × 9958735751<10> × 1035087720001<13> × 3404655742001<13> × 10097787909487503899501<23> × 1038193734970398415809901<25> × 4080607191041244045302251<25> × 216782682017260961889408001<27> × 38210640834394202642216462501<29> × 95504977065720311620692469001<29> × 5368186389476275166937063030251<31> × 247039201197433661135174121833729470366501<42> |