Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 345: | \[{28^{345}-1\over27}\] | 3 × 31 × 47 × 139 × 271 × 277 × 691 × 7591 × 15991 × 416761 × 567871 × 637421 × 734941 × 908041 × 7822531 × 322158931 × 224727078564911869<18> × 521478543273983761<18> × 46968889292310983734429171<26> × 1517655145813456319033978812579<31> × 102851891170858231242633207609301<33> × 35247164015796343390453721280193501<35> × 527264972197836529557199851838274216840527<42> × 6234430748305717761295446672726283589013811<43> × 1344840641680376608506117263739531145118237262742589311<55> × 87724686473407045984586880506193799815093321469457009158951<59> × 60435359848693290260573749180921790064873715387686597491573671616330808132091<77> |