Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 584: | \[{21^{584}-1\over20}\] | 23 × 11 × 13 × 17 × 293 × 439 × 877 × 1607 × 20149 × 30661 × 97241 × 8303167 × 21483317 × 6455953428601<13> × 6899178178539541<16> × 9428689079641451<16> × 1405941375841813597<19> × 1427364308750988577<19> × 11133979244859457087136933<26> × 26743739207247089866609201<26> × 291735354693567319588543905901<30> × 7464630301668237280651468212188413809960173<43> × 1835844463335946645899043268633231545679549380228941168667759174055978247725171002215805897<91> × 5424905842809814580790135175148153005273370039115139875248165723989059011789226683837426053<91> × [3647305427125553980827968494360554894507237249877463689213638665206320969049211686021642267055343519412169242935848199597906300921992444132685998717176627186503172736729676829001569852534148873863052788251035286684038237800619411268426697187883245837550806079371433677598855319037680198838249917406312404400037248367740513319922548289718417881<343>] |