Base 6 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
251: | \[{6^{251}-1\over5}\] | 503 × 34204273 × 59351200969<11> × 80440705758435499<17> × 3489478020025154776405154855930832218902630153636858925509939<61> × 1444373933488902402730227707382763373406047099607827671960402835496581977432355425431282209216381<97> |