Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 194: | \[{21^{194}-1\over20}\] | 2 × 11 × 1747 × 298027069 × 188495925509<12> × 99141858256733<14> × 29748627560719740825024892426535732998061<41> × 5860963105358989903195525558207622859647715180010295355986863<61> × 43405717680902990318449856341748463143189923136522815794131692434913012997754889678341931999705520891459296823065229<116> |