Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 544: | \[{21^{544}-1\over20}\] | 25 × 11 × 13 × 172 × 137 × 953 × 1217 × 2689 × 11969 × 31873 × 62897 × 97241 × 149057 × 300673 × 2610929 × 300293033 × 6857635489<10> × 2691707418840001<16> × 114089969144083169<18> × 5357156372335908409<19> × 1502097124754084594737<22> × 895061946932350301738113<24> × 399981195234791390040813065378761<33> × 852043808963865734150481907266273656921<39> × 19598220165390921695567750379213099546750881711369634807737614641452307929573116372900065295849823356023037283266227371022421068161533380579716737<146> × [2064367797215613680715684603425645683845994519579084965537490983483939085086527552107126858477771253837988787255529253299636589721437822827325032663757409467756415868417417079580268047128196244490399301925206186970513409595997272463563423603666231013998612272315962755140034936367478363525177497079313708612416113180729437366317019073<334>] |