Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 319: | \[{21^{319}-1\over20}\] | 59 × 7019 × 194591 × 340551641 × 1103704099 × 246763300513<12> × 17513875027111<14> × 687613372491653<15> × 12827285265236808653430906247<29> × 2657648273353330727859652749636126246016029004413630425396643172581190964057004153396065773540721470511341838199701935812344221738332030851026138087257906927703252063790464892842248685638156275546916468966318530948168497822893788814839301943662257117601881010680520626614478602971339489554184968704804096003128619615100906147<325> |