Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 451: | \[{21^{451}-1\over20}\] | 83 × 73063 × 14122861 × 83218931 × 17222085343<11> × 914531249431<12> × 17513875027111<14> × 52899783148909<14> × 113728223914999<15> × 133354628858089<15> × 13105857204868891<17> × 143101168379784652869582323<27> × [3538719429580425302272669413903980218767140610985226663074622999804481322102266930643518013470498547144507620808400855598665111812711938354616303784597052591019370324428593318079370475040012461772935485422430621027809169089640904642083517425999057800885730035527027320521033273604210123202007746343420311202259686579065762587349995788175027417526569865001073807554871172779434155374050930105313320097297985226054028425588960204409973029499889381109393849<454>] |