Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 87: | \[{15^{87}-1\over14}\] | 59 × 241 × 349 × 798084409 × 15476275967141572773889537007699<32> × 2434454875515985938258837058986771053264041318453337821<55> |