Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 247: | \[{31^{247}-1\over30}\] | 571 × 14251 × 42407 × 2426789 × 7908811 × 1319973929 × 9705249971<10> × 88770666332610762169<20> × [1028758294851324901672688535639659484863620721047112189395412066054071119294071973160540916526787436864328704276470724427676317783836975908447408771550791775351740313519181136187037435269673052781175743664224095742284446648457852770988304861586444568547269859717430172030695389770951208980380422229210499<304>] |