Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 428: | \[{18^{428}-1\over17}\] | 52 × 13 × 19 × 643 × 857 × 30817 × 73189 × 374929 × 24934853 × 239608739 × 1650947941 × 931916122933<12> × 832761290363531<15> × 7731874493772323357347<22> × 69973191647290497588630127823<29> × 243745273665117676332567877193<30> × 540918390282121562487078958501625881<36> × 373822013358964207195535689489923040890019181336423948514739110673<66> × 38251550128083002151841906519872558190379652108158745082364635658052035389697809<80> × 354891121878588694681349312682405514887073712623527701407655951907915754837692739<81> × 13320963088452640035240831553482931729827966557301788101912238173553583150642528505753258272682918720732215315256236709<119> |