Base 30 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
81: | \[{30^{81}-1\over29}\] | 72 × 19 × 757 × 1783 × 3727 × 729027001 × 25065552102266095813<20> × 137317950448357919059<21> × 611535125150697982861749583<27> × 2127637958208953385492282232693<31> |