Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 303: | \[{3^{303}-1\over2}\] | 13 × 1213 × 33034273 × 465092326319<12> × 50316775668019759306202964023<29> × 464114346100971670261030354878981449019613<42> × 326636194545584172162542275245797314912866877527529<51> |