Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 520: | \[{28^{520}-1\over27}\] | 52 × 11 × 29 × 41 × 53 × 61 × 131 × 157 × 521 × 547 × 2237 × 14561 × 29201 × 41641 × 53951 × 84961 × 114661 × 614657 × 637421 × 1598039 × 72416371 × 86603401 × 115508406521<12> × 2863024493281<13> × 78296083533149<14> × 4543753614603737<16> × 90216355836698261<17> × 687858517721621226917<21> × [3333413857480698008873687780690155975698907830512207355268955582660165210039751722438476953786188506673000869857622477110921880057030059236882027200302680792037187165492618582215613436281266291588785227030232928738268544883744659615807346842094115759138692009516098698281418160539498550289889403088745278465266991349833193957487798989510251012947739913683271007611446449921093872989802742337466705126685608400331096109473963791327128392372982733730565053272606075425741649377500380528657243396831505927308580120907684924593948949467792723091148601410158923347506530276051862621<577>] |