Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
131: | \[{31^{131}-1\over30}\] | 263 × 787 × 141481 × 436231 × 50985878321669<14> × 492720843616088468400497945831939180277753459209351199481<57> × 242585406730506165131491575784491109922965362651339569542053097118441665907267066694750490401054186043459919<108> |