tables > repunit > 21

Base 21 Repunits

Table

Viewing: 491 – 491 << prev next >>

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

* 491: \[{21^{491}-1\over20}\] 983 × 7109681 × 112405613 × 2580658057954460489<19> × [399688473455744962157698674069557696166089852027525102897276556932625832935959013162071705523258711886922553966222353757302916453174916885675368331711381608565394264452296163995732884569484784123141622546253839849753135783046812289597467747221317353405657254996835482819088092817455860896057425492564499801243100342412008578842769670441365317045160334115188118798370928150044233028503851877937088701801131941855186695213412325803440358451804846384899261494851259642526123133083655416221992950683791616798260917886939055522813343251159726341946298010251097965428509246142168777746088050759741770263231680511636381<612>]

Index range: 491 – 491 << prev next >>