Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 570: | \[{21^{570}-1\over20}\] | 2 × 5 × 11 × 31 × 191 × 211 × 421 × 463 × 571 × 2551 × 9391 × 18181 × 40841 × 185641 × 205391 × 304609 × 501001 × 609673 × 1084711 × 3079711 × 5285953 × 67505443 × 12061389013<11> × 18806124191<11> × 19449969211<11> × 54921106624003<14> × 619598441951897251<18> × 987749814642143197<18> × 2522688573446019221<19> × 694155614288478272051619864571<30> × 1168393184916024427650240126995059<34> × 1244541772187848099210936765314595053007129<43> × 4962575794097659196896553056277931780683391554141<49> × 224946077318312621202864321882925242281698103188770132390249098696465091061151<78> × [66470322838106444567481701411888139523258442754511850465204782608795045255251352068847644054704322699705340905151687277116022706671410660051638592550233913801<158>] × [7171302558083721257038391353653621907015035318302205077618241576428817766424935355610714087229730428549861022781908237377472157025140327120033104331991524000072664158378920242921<178>] |