Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 343: | \[{21^{343}-1\over20}\] | 43 × 631 × 3319 × 7057 × 8233 × 1606344741163<13> × 1767442850839<13> × 164536622107410815263<21> × 1703751007820049542146461103<28> × [39870525451896322797751491616220592612184947881234847253320651656501421346752604225082159607750546032780951476191302621750053523160015794166969949362687516740010636001297924684683990385822241782813400723782847919899067148019372690342136251499806601365371667771934105874937357418775465140152714418904984281778126351759948813262840912032514769261598390089125110833853<365>] |