Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 372: | \[{20^{372}-1\over19}\] | 32 × 7 × 13 × 127 × 311 × 373 × 401 × 421 × 1489 × 4093 × 11161 × 12277 × 40487 × 75269 × 406969 × 1646101 × 340037881769<12> × 49755231685693<14> × 111160667194373<15> × 581740080393079<15> × 4677213964284283<16> × 335566676799518320433573040127<30> × 635896140113507011824097778781382199751604398154509736423<57> × 27736737856153197269675584866568095122351352801389778813467369<62> × 735669815930822532937503688968508571966425959548932871142136554846387363229<75> × 6543398297477807647866655566694839554473983620565828015189908920111902567603400736291000800651376024602769800562650413385680712923356400649<139> |