Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 155: | \[{15^{155}-1\over14}\] | 11 × 311 × 4931 × 5581 × 23101103879706781<17> × 2680375722923963821<19> × 530788252571672548054451<24> × 660603097954354915026956925328631<33> × 6879022048891933664493038234937096016443431299080285798525470822702228981159231<79> |