Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
331: | \[{3^{331}-1\over2}\] | 1581832451 × 16312845121<11> × 530654464353667468092169451245888744365152829791<48> × 3087473940212185789456959767328406647818323751575631706069393139992405721825272733020818593<91> |