Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 315: | \[{21^{315}-1\over20}\] | 5 × 43 × 127 × 211 × 463 × 631 × 1471 × 2521 × 3319 × 4789 × 6427 × 9391 × 18181 × 40841 × 51787 × 4149601 × 20028751 × 41489011 × 57815101 × 81090871 × 85775383 × 227633407 × 3987476221 × 22125429901<11> × 27186384126763<14> × 421503321597121<15> × 22554946693833031<17> × 100595851688887003<18> × 667866235603160161<18> × 5124240195826801224421<22> × 9836871692461559260201<22> × 1855106691418101398774071<25> × 22992462429148755837481956896925474251778386308301256361<56> × 65905326112538087859370066574780956755259359465410354740062841628535328585142082545232567001<92> |