Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 115: | \[{15^{115}-1\over14}\] | 11 × 829 × 1151 × 4931 × 31741 × 53591 × 100511 × 2083752851 × 740265963181<12> × 4088280880261<13> × 3046462151831565769<19> × 42460920908092999453501<23> × 17616646658610304480313635124812321<35> |