Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 245: | \[{28^{245}-1\over27}\] | 113 × 197 × 2521 × 206501 × 637421 × 2155609 × 4422461 × 319343666713<12> × 5722634214641<13> × 1406989148070316021<19> × 99885743242098024883367081<26> × 44498235948084746667439513476081194102813<41> × [164688218096450907738167060021460526148107205247237885496745189524569092581225166486892412737658501083314440487661104764060640234586366296654834673919789268068043182978605444307799826081411362633573616462515795501<213>] |