Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 259: | \[{3^{259}-1\over2}\] | 1093 × 2591 × 18131 × 13097927 × 17189128703<11> × 162333897165894374219502084711820738217342060415953888997823188755421387607705331738999130859381<96> |