tables > repunit > 21

Base 21 Repunits

Table

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

61: \[{21^{61}-1\over20}\] 15373 × 12519763 × 1128331159687<13> × 1814065850324073713<19> × 57398774322642953389748085156004642469<38>

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