Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
407: | \[{3^{407}-1\over2}\] | 23 × 3851 × 13097927 × 18354073 × 17189128703<11> × 1862400449807666627<19> × 113176789235732088245156298174091378321319901328456954530538039849296710674925574582600313964679099854322125957498606090030991353130370649953492691<147> |