Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 605: | \[{20^{605}-1\over19}\] | 113 × 61 × 251 × 150041 × 2209901 × 257277256721<12> × 308867167621<12> × 653896803011<12> × 2431995161971<13> × 10778947368421<14> × 358702689498189521<18> × 2571413672161047121<19> × 1479984625418115630551<22> × 167103718909962607171187251<27> × 4095266462546363554138063681021<31> × 2681720889038828727849704112554245443090838091<46> × 207460499909279296762540583487933439637201905299100245238682598870759408878141960495778332780218147735503696620877792011<120> × [58602041096260247975098523001000801991389949176742673212718625786147192387744995236208924986139543570464449110308837681195873599065929868632005955700568981046212243254800194260011<179>] × 2492953502193153415856303622868604272192729069908529652194038470422160268297265719562151142438469080967525397823422716258838982214759132913745558455971140145479045466177325648241176293012293763612433017247903126683646320976322299963094116252244317431<250> |