Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
355: | \[{3^{355}-1\over2}\] | 112 × 734346611 × 66824157595186257988571<23> × 3754733257489862401973357979128773<34> × 535570173289641571416614382750786152319699541935518136492038769107751005229575212807101626023300886161<102> |