tables > repunit > 21

Base 21 Repunits

Table

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

* 768: \[{21^{768}-1\over20}\] 28 × 11 × 13 × 17 × 61 × 73 × 97 × 193 × 257 × 421 × 433 × 463 × 641 × 673 × 769 × 1217 × 1409 × 2689 × 3181 × 31873 × 62897 × 97241 × 300673 × 527489 × 1001713 × 25392481 × 92625409 × 518118697 × 6586149121<10> × 6857635489<10> × 70660081537<11> × 93310250563834657<17> × 116857306259324929<18> × 7196013143150373330433<22> × 226108215051938888394049<24> × 47364380213310995446855681<26> × [2628443650317089074840320215431310399756507432268856618292311261901514347950194286924149388980906266649882871300246724541320726236507612961544863756299960744812816937882481918089694381334803842827926411026140111546063610681229253915561581087235935534655647626431929614365209215242326772254945933097662508374018328273235768838911343257978845221584477338616475971351431799918195659017629470273385690510135764974629440152704239262301516184160573143143466844942526994290712935005009862713169808738840260224882377002821344528162054561033066109614648105106868018546234855882480020368843794387909148824312436049722210949264634060185154290889211514227210674782928966435657832830404015052344215215766371771385288513930504748793806131533078833254048090362954248163460919647908439136674497<778>]

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