Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
311: | \[{3^{311}-1\over2}\] | 3733 × 12460588823<11> × 873069502041694941443<21> × 2241207330424850668586082361185081412667449<43> × 133214903610334121745028373807408359032562882470844866249400730761994821<72> |