Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 405: | \[{20^{405}-1\over19}\] | 11 × 31 × 61 × 251 × 271 × 421 × 811 × 3001 × 6481 × 10531 × 51031 × 53101 × 65881 × 261451 × 64008001 × 150773239 × 309168901 × 879338701 × 1018404631 × 79083953101<11> × 298114935351301<15> × 3994611390415801<16> × 2812704357928371121<19> × 3028317256063307431<19> × 240335499722572329841<21> × 4340106427193878623481<22> × 7599707813206155097384225291<28> × 15721667458073376459082354447584949<35> × 248995526573042697684641524038945001<36> × 2684231601259323415910288316630697462902031<43> × 7595481316731075482256940190990890428324282356745335027453861475746326651<73> × 694409976824399152062919288051755304626612847394706315888363352212093447665241377778022368729823595085721<105> |