Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 262: | \[{21^{262}-1\over20}\] | 2 × 11 × 263 × 1049 × 37991 × 2470162463 × 229027002385831089465739609724278489582787<42> × 13687052074332591601541282383301905745371122445745433886164039445273884190933317364799124290237834799701349135257178899<119> × 739040869084130473305241038432395701395262629456621866219798431117400035338424967437810456788618690223141225464794543410806325743594517895577536723632278304816821397<165> |