tables > repunit > 21

Base 21 Repunits

Table

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

* 409: \[{21^{409}-1\over20}\] 257671 × 129520197701<12> × [9188793863950318389935996849505917062206031036486161346900395933158852427053443105286664462479733845072703371215712203210722211051325862944983735044946737908358477092074826529517930854549002896998736518223987509220105607809543408219769618410310713880206694119620720430665113394106681014082408233968160102932480342109398413214423928924567576076690217172074403989132992470525740274084088857815830566618416727640470469210563098562490020511832964670906701215339293691725531520577034670230953911576078369517521202609459294848099<523>]

Index range: 409 – 409 << prev next >>