Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
65: | \[{15^{65}-1\over14}\] | 11 × 53 × 131 × 4931 × 157483 × 16655159 × 2019047273585208433900886541315654544678694069335036331<55> |