tables > repunit > 21

Base 21 Repunits

Table

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

* 391: \[{21^{391}-1\over20}\] 47 × 3911 × 19597 × 557567 × 1266841 × 168352411361974303<18> × 1502097124754084594737<22> × 139870566115103282847737<24> × [5401024132570296952248983950817360287892804279035225311996447325648058287292932719983474483433187989570700011411105099022147629942516862804646595009743687861048988243116305509613671007563121817556198341894310225314935571922221331522124202079881644646371447218398686643100493078569016613713502532954749528415794828189528832089126451494400810357811881086085235311309652336805511283525283577861669487889964707866533770949900274670215471<433>]

Index range: 391 – 391 << prev next >>