Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
178: | \[{15^{178}-1\over14}\] | 24 × 179 × 807409 × 12684688516982941<17> × 18500463452718361<17> × 12556389966735717239290312867405392279627344229633295496808036453334967380715171<80> × 2315913135944576503920501141755422604883642317976671323564141551398926392942849492530221<88> |