tables > repunit > 21

Base 21 Repunits

Table

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Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>

* 379: \[{21^{379}-1\over20}\] 31079 × 447221 × 3509444385258683139871<22> × [1354737396025213792464490323832923121656631228343265791658344573824412093866603877950786491163828496692217518603616289317415190090515959183841145204869560421173495192613430517890639726488053989576600320320242392333895866397137478039556636399363628588034178893296710782369977477750983903256302108742026354740200847349959573862035406100071031649416119415671851854686854643119099501470405515208447688556373524173562464191993993413616261767863334471340445113363938059198291<469>]

Index range: 379 – 379 << prev next >>