Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
289: | \[{3^{289}-1\over2}\] | 1871 × 34511 × 44507 × 1088953 × 123464991208881406905795411233960726749691238502531224478704471734028506037476876109798109673292083661164501826940154891<120> |