Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 232: | \[{21^{232}-1\over20}\] | 23 × 11 × 13 × 17 × 59 × 233 × 349 × 1277 × 2089 × 18097 × 97241 × 554017 × 1103704099 × 1221702721 × 246763300513<12> × 687613372491653<15> × 1792484183066669<16> × 12064146485993225890171648153<29> × 7865855595529911658005355038639053<34> × 247096173349069999696204534489403326701538495313<48> × 9759093518513238012039627213817579718073176623974473<52> × 12485707657621198660485224454558007675476845125160521<53> |