tables > repunit > 21

Base 21 Repunits

Table

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

42: \[{21^{42}-1\over20}\] 2 × 11 × 43 × 337 × 421 × 463 × 631 × 3319 × 4789 × 6427 × 81867661 × 227633407 × 22864311556633<14>

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