Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 338: | \[{21^{338}-1\over20}\] | 2 × 11 × 79 × 677 × 179479 × 189437 × 516094151 × 787331117 × 1577317561 × 7021471715414521<16> × 557605383899089518711683136416448125851528873<45> × 10067791945474325101972414912058006006403226592219<50> × 51032784753339594393762302249756328003879131971060424025791<59> × 171564464729856152774467062654463962966697643483716434062178260690633196185933766429700538132281<96> × 4594130155343871975058851367976626872561710502528706854567172756009712468440851511490609405787706740526924640052740822297629391041650057319<139> |