Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 329: | \[{21^{329}-1\over20}\] | 43 × 631 × 3319 × 29611 × 49727 × 227011 × 3896677 × 75042551 × 158545759 × 5298873343<10> × 276533040841<12> × 9794718038248648833094153<25> × 2555297888037332975680014407433664066305743566875620118551286915555003826560088515953866202860961262407684523247564095285392506511653775420024478630625556005475510356090842870527104183868524538806793231641777283154472663257972602981496747796681908810690271951075223553419214350295644063097962205354335724031425236836417837226522423761092266743<343> |