tables > repunit > 21

Base 21 Repunits

Table

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

57: \[{21^{57}-1\over20}\] 463 × 304609 × 12061389013<11> × 54921106624003<14> × 1244541772187848099210936765314595053007129<43>

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