tables > repunit > 21

Base 21 Repunits

Table

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

46: \[{21^{46}-1\over20}\] 2 × 11 × 47 × 277 × 461 × 599 × 691 × 19597 × 2215825387044753577<19> × 139870566115103282847737<24>

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