Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 186: | \[{20^{186}-1\over19}\] | 32 × 7 × 127 × 311 × 421 × 1489 × 11161 × 40487 × 75269 × 406969 × 1646101 × 340037881769<12> × 581740080393079<15> × 4677213964284283<16> × 335566676799518320433573040127<30> × 635896140113507011824097778781382199751604398154509736423<57> × 735669815930822532937503688968508571966425959548932871142136554846387363229<75> |