Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 302: | \[{21^{302}-1\over20}\] | 2 × 11 × 907 × 3843132409 × 6761621753<10> × 3974667798337168284581<22> × 71961086116587981948793<23> × 86925566545463574785698705608720765611<38> × 33915399804509928260923827412471432376581621841865488579<56> × 1653679523357922346828072050382592817945343190501946834331<58> × 9531410770826390887491058487725293094939711222086215343561670044365596822661<76> × 14821060283992203753220587630846186567475544369812675624726529439092031886282399777198385098934169620087<104> |