Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 220: | \[{28^{220}-1\over27}\] | 52 × 112 × 232 × 29 × 61 × 157 × 14561 × 19141 × 27017 × 53951 × 84961 × 135433 × 637421 × 6077039 × 50545507 × 16071033331<11> × 346438463911<12> × 540610746853<12> × 829366011211<12> × 94275090945167441<17> × 5906633396655970661<19> × 23946685543873549601<20> × 2091907155977893174797613626701632222782136241<46> × 845628636631651934504927886799751875681499063835527561<54> × 3664812807816111424956224380186583636096628653694560427701<58> |