tables > repunit > 21

Base 21 Repunits

Table

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

* 277: \[{21^{277}-1\over20}\] 21446993970084181711<20> × 570114508876330503419<21> × [7351671999366127437169981752985237588628658160690702230406992577442264691885259155778630305237054018821233457338442984979349154320156244689946480666964430487687418649222429826362033485839145225957650276410919923657652053746634936603269506088751471100704758295035958598584666955389693889589452256240591504986755031736170844233<325>]

Index range: 277 – 277 << prev next >>