Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
131: | \[{15^{131}-1\over14}\] | 8310543061<10> × 225909282151193<15> × 2672726277852351048400401941685857214023231112663546845790173<61> × 166459634738560254451837528673170712725691997899058351345139297727929<69> |