Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 279: | \[{3^{279}-1\over2}\] | 13 × 683 × 757 × 1117 × 102673 × 4404047 × 26273701844015319144827917<26> × 73359691843377278752103317712455408871941453709380600726770643232683599826872817565929<86> |