Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 233: | \[{20^{233}-1\over19}\] | 318073295521<12> × 130308709030859<15> × 12591589319309944829<20> × [139204792536965019548268671820335611138542174521639340421057045686296154784934492458175689654958927168385772607806625497428228211176002844054013878037253706130134977363578628227622753191508934621762391549455061728829717564333603487165123964025773265597348891<258>] |