Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 665: | \[{3^{665}-1\over2}\] | 112 × 71 × 191 × 1093 × 1597 × 363889 × 2664097031 × 8757948941961838067<19> × 78958087694609321439660131899631<32> × 257513776243156826379279929309507<33> × 195201775934302090157846526852175880612378830966204323061818813688094844198348372748954086532447242145321401055909636088157126823701491255873796824306824956676130190722951355298387065039607189459297757591521<207> |