Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
155: | \[{3^{155}-1\over2}\] | 112 × 311 × 683 × 102673 × 4404047 × 3586225081 × 1078579799806668629607014283525941686969924751<46> |