Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
293: | \[{3^{293}-1\over2}\] | 587 × 64911612051881874971<20> × 821366793694609363786586651424442764586582465726578000607890252986750548525784235602653759898115835317059892460938193<117> |