Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 52: | \[{15^{52}-1\over14}\] | 25 × 53 × 79 × 113 × 11909 × 16433 × 18617 × 157483 × 16655159 × 30313817 × 151747597 × 1539711288259<13> |