Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 247: | \[{28^{247}-1\over27}\] | 53 × 21084187 × 26223991 × 833707237663<12> × 44917747781843<14> × 4543753614603737<16> × 5504044949138999959<19> × 17343672949449551459<20> × [218307721144255667031016594228618736809012348503435245595254701340121740007226484852128238342565108238747474910616919436786150503314350069660550099163831846812097616031789894879223188856379662511724731539467011721274760481934514114314335190033886423593533275941<261>] |