Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 287: | \[{28^{287}-1\over27}\] | 83 × 113 × 821 × 801469 × 4422461 × 32512427 × 1040444189294161<16> × 4495294535482012470972518309284152114589<40> × [192714532541662224205792762182369054330311787511210678341954946890097584904459692070313522969483261188126574782115818960871700465768964995531861380148035031937159710933944684578966806495691974140245442971655257201751551034072043244593462147695877556865574938317915589624188445862735557786934249354705300248602281107686018699948121941<333>] |