Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 391: | \[{31^{391}-1\over30}\] | 39883 × 1509997 × 61562537 × 12688875107<11> × 2738296841431<13> × 7176374761323733117<19> × 751670559138758105956097<24> × [635893409352603749864825892410015542832479558415051824900782358415694580600530497789483074823053512704077720340006666836898704795740844757216771170239369277098203259344385326444480494219275255422260805073804688787363599356913361304225677051041711016924182652720096693420558256117296472937331033453819310780965067172586394039147649781185647725319413370585937139997325768516850085487231494569086438257732240108640566568559917178865010518046832101683590036133199346433027487016390218023395222444589671<498>] |