Base 19 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 291: | \[{19^{291}-1\over18}\] | 3 × 127 × 1747 × 84391 × 350286401 × 11542175764721536214759<23> × 2406871247546906126235451908529<31> × 40646153086401114968237384448253<32> × 62468771853453988907994855172682616050526469382576404972295431<62> × 52440294567042147348168173230408693571429997858136294379909988429415424401537077268175318626988601027192753300536559304268635706399386505716551813460276876240483463341799482271204679887453576708443604242801<206> |