Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 388: | \[{21^{388}-1\over20}\] | 22 × 11 × 13 × 17 × 389 × 1747 × 3881 × 62081 × 157141 × 4006489 × 298027069 × 188495925509<12> × 99141858256733<14> × 29748627560719740825024892426535732998061<41> × 5860963105358989903195525558207622859647715180010295355986863<61> × 43405717680902990318449856341748463143189923136522815794131692434913012997754889678341931999705520891459296823065229<116> × [1242268559427866654287210786532432833769134328827237365059887423874130835242557188879113793875066012934957330543167490171971775363423374088965318423477430770295220801289590080549581471063273346210214783442893242621826872061186253401<232>] |