Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 598: | \[{21^{598}-1\over20}\] | 2 × 11 × 47 × 79 × 277 × 461 × 599 × 691 × 2393 × 19597 × 189437 × 516094151 × 1682402437 × 7021471715414521<16> × 2215825387044753577<19> × 139870566115103282847737<24> × 134128047772101091783603699<27> × 295968034144509472802855739887701691<36> × [69353360881710201890177637529332657170624602569131376082082629377339473147783723884230347486881720663213512926336525917137621844629726392672630664487653198798649334959202344359094572458482004422051674660697867778748313062125310793195022640055581743914019821844549678668189189<275>] × [12192624413984962480474925286110257309039415643276900052223764889180148126625733957490600765404960527463289700650520839966163740181714594401259478638352685902676242155655489173486843546189175783965952080486006395306310361219123427178752397636619210773113604082742396965168096250785310356781941674870282592289679365452665805640036370025634985213080241<350>] |