Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 440: | \[{28^{440}-1\over27}\] | 52 × 112 × 232 × 29 × 41 × 61 × 89 × 157 × 14561 × 19141 × 21121 × 27017 × 29201 × 41641 × 53951 × 84961 × 135433 × 614657 × 637421 × 741401 × 6077039 × 50545507 × 16071033331<11> × 346438463911<12> × 540610746853<12> × 829366011211<12> × 2863024493281<13> × 52121541512921<14> × 39246618169749761<17> × 94275090945167441<17> × 5906633396655970661<19> × 23946685543873549601<20> × 59716358541760548549065761<26> × 1448228946058179249880169408969<31> × 2111945314935329194042694998272281<34> × 2091907155977893174797613626701632222782136241<46> × 845628636631651934504927886799751875681499063835527561<54> × 3664812807816111424956224380186583636096628653694560427701<58> × [51881905321392740728247697661283772189054701241114681546979346999271038208174985672329067038500857187615348666763431548982728903848227392625421293014036521721<158>] |