Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 274: | \[{21^{274}-1\over20}\] | 2 × 11 × 1097 × 2467 × 6577 × 1434935907463<13> × 26713431631673<14> × 45072031559057<14> × 72752932313208962053<20> × 439568420979596620584991270597<30> × 2507048871610995663351125327991556777<37> × 89324288253958545575960848255100747898230610360730950584438935339339<68> × 906193681456707580838400375898716247385087311629010157744891281795665029<72> × 2210704839453987084654529873799609279235272917800596662452622653082037998178772558979<85> |