Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 459: | \[{21^{459}-1\over20}\] | 109 × 163 × 463 × 919 × 15607 × 38047 × 4779433 × 80031547 × 85775383 × 7429452749713<13> × 625770304116639832567<21> × 1502097124754084594737<22> × 34098331055594280023053<23> × 847586878961383719143557147<27> × 51233569124705721849500009982296618143<38> × 379395745875808971155324352649338339586035997<45> × [685237894507050040563885356279043437812291590216413304664511359525142398801184515830026011614569559273921435949816330680739642324986683349094584889766957214945421185124929214480878424084527250471876945956539811382044114737382982693871751620267383757112185709748858867461363621705664188703335787065413255324910081844803099851502298262850906591159133544773972136479118705982679399<378>] |