Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 124: | \[{15^{124}-1\over14}\] | 25 × 113 × 311 × 20089 × 856469 × 958459 × 12871001296201<14> × 14572134604887829<17> × 18167443254760948901<20> × 660603097954354915026956925328631<33> × 117107805549292247865914823046429217019361<42> |