Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 286: | \[{21^{286}-1\over20}\] | 2 × 112 × 23 × 79 × 859 × 2003 × 6073 × 189437 × 207923 × 5023019 × 10362529 × 516094151 × 944156929 × 165238453381<12> × 197647219771<12> × 17513875027111<14> × 7021471715414521<16> × 19725500031525136314134334713235761<35> × 713255542756934588000409316079479675200443737<45> × 87860558614985868619208135942899601679373945780409616385819485260873992836605828525341<86> × 3133215050775538159999253890862035621216929079706901880925831712192141277620814505531687549750066100763<103> |