Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 333: | \[{21^{333}-1\over20}\] | 463 × 4663 × 6661 × 31081 × 21475393 × 85775383 × 139869991 × 1681762703 × 21730719529<11> × 72287796711413719<17> × 486919917586369829557<21> × 7995105693353508392600118377453099<34> × 1506746820371368761835938047460405587619684925236106295173833131814373634461587418519<85> × 5577764194846550586760598533309844182167795633703822116797656852930333337714722373900755309135795600697984101119430323804588814039573252327862686898278380282943602242337826878255704509180587302780523590455224669079070577394273<226> |