Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 248: | \[{31^{248}-1\over30}\] | 27 × 13 × 37 × 373 × 409 × 1129 × 1613 × 62869 × 145577 × 415153 × 1859009 × 12703553 × 3938289601 × 35789156484227<14> × 2706690202468649<16> × 270643850496354846544013607007314897553153<42> × 568972471024107865287021434301977158534824481<45> × 729527663868489818869443753655962819807690366535991304169573580552940020358902345617<84> × 3651659555144994342750042192178499371765497603880959707767092784427769802986620957528477806724519424370112473341121<115> |