Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 442: | \[{20^{442}-1\over19}\] | 3 × 7 × 443 × 2081 × 2549 × 3121 × 142559 × 2567783 × 2640509 × 9690539 × 92054423 × 170587691 × 735408649 × 689852631578947368421<21> × 166379033411985795663289<24> × [89422363295708026380161381893337781409275651920096449387424574396257372888048333089188287843076706724324789083909045797561167784844329134447801862349589740268857082458235879362687312620335158271622642013611079331531614309223<224>] × [34957074649760906831419584094087417577344990467546164804287965727348304131681987269180192833352195892952597507671392121690529961904066908012112933537331040222702995711575573515569401750839102794860531626615146179883622653397657812026094661191<242>] |