Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
123: | \[{15^{123}-1\over14}\] | 241 × 1723 × 8430332222527<13> × 114557014359607<15> × 1296290182141167360809609737147<31> × 14052995136749824817978552692323583<35> × 44612545556379601866218236511065863857423885983<47> |