Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 298: | \[{21^{298}-1\over20}\] | 2 × 11 × 1193 × 7361367053<10> × 4149000929822858713<19> × 3562026657560934335039<22> × 19200704422015926819331744380572154435059819<44> × 53919242439762773005242386860200557456243874686294562852445931950590020366014258150390180061554764542320310512176525567625295129239<131> × 177662838341859118298563667045445869420950750932915799555372806733123504535876119642503130038592356223250753712638426455713623800482104453797633975661090040975393043<165> |