Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 516: | \[{28^{516}-1\over27}\] | 3 × 5 × 13 × 29 × 157 × 173 × 271 × 757 × 1033 × 1549 × 3613 × 5849 × 47221 × 56503 × 60029 × 684217 × 1257493 × 24385817 × 44447209 × 62167681 × 151452193 × 105942074311<12> × 23321405465263<14> × 280931610243662693509<21> × 1674308142257052765313<22> × 17068111104046291434149<23> × 64933643933053680351517<23> × 1709917733284391730017137<25> × [6076543864882299910292441972051807320352354200139645589745307300765742687584332700185314332831223205840628497402967479216990396568239896354067760069593855012024601717882514198047099615456500734988631847367424708300876583246700518089565041920660322447521283258224865513901318809249282050847539235725400385813073051008364865292567875510966859474789891147551964455582575631737675383277406521496162806191311364024075973393499912627009902617729670308677567020375061502616665326120539732088921040717742941555812194336376311822409663<526>] |