Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 208: | \[{15^{208}-1\over14}\] | 27 × 17 × 53 × 79 × 113 × 1489 × 7121 × 11909 × 16433 × 18617 × 157483 × 179953 × 786553 × 16655159 × 30313817 × 151747597 × 736921904993<12> × 1539711288259<13> × 14685091347707873<17> × 290340653215025713<18> × 24533935088352456090993589892052329<35> × 58816865685030314339215849136647366687489<41> × 6381601424494857941307177734156593263007601<43> |