Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 248: | \[{15^{248}-1\over14}\] | 26 × 17 × 113 × 311 × 1489 × 2729 × 20089 × 856469 × 958459 × 218813129 × 12871001296201<14> × 706837123594673<15> × 14572134604887829<17> × 18167443254760948901<20> × 660603097954354915026956925328631<33> × 117107805549292247865914823046429217019361<42> × 3202921133379138417416339592359963846701350877713586781829571212060909272723514514875483088889225483439982185631457<115> |