Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
253: | \[{7^{253}-1\over6}\] | 47 × 1123 × 3083 × 293459 × 1106436299 × 31479823396757<14> × 35764102873412466090911077602159546824955533626915413469<56> × 18082074864415377367068243954486555860740228320949232027155050843447259982906797331116646925519623217698584465005700448879<122> |