Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 303: | \[{21^{303}-1\over20}\] | 463 × 1213 × 145441 × 203011 × 501769 × 2782147 × 5766091 × 322064357 × 24924183446932183<17> × 9169578247930711724838223927<28> × 36945809153030964318516966609973698395187560924157000812220580201578519173448190367<83> × 5909143768005313753852551264709864272399626232308684673520582334032834657456010918823243225305989506256439544088943583754476109398856338348815897443820832538308788471605821746404587919758660128760381341389759640830619123631451801<229> |