tables > repunit > 21

Base 21 Repunits

Table

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

* 251: \[{21^{251}-1\over20}\] 503 × 78497670331253724483874099<26> × [95408755198790088635939514575820110121494371990226577967338790350124991135883415563639490230016970059128183784954374517887588056236198710640427456908068509662595786420070752294855942176711318045055529406366067342391685259279016280171120071967069592828843073281753701754466104839197931183846372400773883<302>]

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