Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 291: | \[{21^{291}-1\over20}\] | 463 × 1747 × 1020247 × 82545061 × 298027069 × 99141858256733<14> × 714162571551294961925717449<27> × 29748627560719740825024892426535732998061<41> × 5860963105358989903195525558207622859647715180010295355986863<61> × [1163506148294603039379914179049705966187548352806989545057754622755487917729510988122545430902601197530151426634559212347445609682906813470486226114051919626137781231376369819163092651895848670192839877507709214787<214>] |