Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 366: | \[{21^{366}-1\over20}\] | 2 × 11 × 367 × 421 × 463 × 1831 × 15373 × 75641 × 12519763 × 15569711981<11> × 57733681069<11> × 578011194961<12> × 1128331159687<13> × 132538677158969693<18> × 1814065850324073713<19> × 37376752870606823789<20> × 9600772802405878717656259<25> × 57398774322642953389748085156004642469<38> × 3802536447549432836440638093101251935825010803727692773605408761917053<70> × 221035599730205471707528379703784689349490485050259406402291165941942927878997<78> × 4178836442844651515511329527862686487954990612118576877028484300815594328136337574487489188497255773480504997158374044802523431896824973648289859<145> |