Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 545: | \[{21^{545}-1\over20}\] | 5 × 1091 × 3271 × 9811 × 40841 × 27676869071<11> × 1045202516191<13> × 252649631352967<15> × 243559381356675673<18> × 7232800791148967537621<22> × 1075844735830122358017703049625189977667287013021268821502115973717283800539785976074877960131456456976157869419<112> × [2054488205209093113874279626610548191916023669151271276489658492085349786212651840942659666346549077546935009519237303361105749324662157528006220839985177744266808412946270146199265257785511209481656578850632990119119541621123864956125688726114142653093254993163696911830654816632535224995996169688362795140081237235310336058647849475752663513276072533977721518559456626621359269667982594142400284196529676960625372116190008901568638887376281057642305697137143614809199928198376909921830532853740430311024134402892771<517>] |