Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
71: | \[{18^{71}-1\over17}\] | 569 × 171677613761<12> × 23821298356519<14> × 8313279867213693856690162577<28> × 404888252726379587195529885794129<33> |