Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 420: | \[{28^{420}-1\over27}\] | 3 × 52 × 11 × 13 × 29 × 31 × 43 × 61 × 71 × 113 × 157 × 211 × 271 × 281 × 421 × 631 × 757 × 1051 × 1861 × 2269 × 2521 × 4621 × 13007 × 14561 × 15991 × 29443 × 35771 × 45541 × 47221 × 53951 × 59221 × 84961 × 93913 × 132679 × 206501 × 637421 × 734941 × 749729 × 924841 × 2449561 × 4422461 × 6313861 × 25917641 × 52000411 × 84673681 × 688406401 × 1100860153 × 14961516151<11> × 31384274881<11> × 317689739221<12> × 24155172245401<14> × 40860961267393<14> × 105632155735261<15> × 2005875869991701<16> × 14070581691669049<17> × 223934956756993189<18> × 102324803053934305339531<24> × 99885743242098024883367081<26> × 98336245890572745925217555761<29> × 11536371289790796513662140395301<32> × 186588025377723189289148440439335730789668617380687881<54> × 121472104014598896667779464986019001665861519088940386401<57> × 1873801180942627318903993977778770585186241706387766246749839224912366481<73> |