Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 305: | \[{28^{305}-1\over27}\] | 117731 × 637421 × 584814157619<12> × 108152440326426913<18> × 20522193990819752311<20> × 11071894699054087656875578952698529117084924031399006144383<59> × [82988642139117303105616200359341264777916464291538253062512223836929009021310735501312725640900312941331234519383721805692920635942050180753357998591633412606320453707973980772040270976551429098006865175269920604027236054895340725486065940279823703442984805618029410742908251712214737665639754677581558886780726925955636961<323>] |