Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 140: | \[{15^{140}-1\over14}\] | 25 × 7 × 11 × 29 × 31 × 71 × 113 × 1531 × 4931 × 19421 × 131381 × 531581 × 1743463 × 4167731 × 10678711 × 497638891 × 363860910841<12> × 4454215139669<13> × 36083117529286469251<20> × 53096945644422356461<20> × 1471639728507736930149132068430094904381<40> |