Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 271: | \[{3^{271}-1\over2}\] | 3253 × 8916443 × 490543245624181<15> × 2709600825365281117<19> × 25868527977712808361978066658579889576559130208360024345084977414463027844372456066131<86> |