n!!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 273: | \[273!!!+1\] | 6106457780592163<16> × 38988209585610893381<20> × 23087847540618926235571<23> × 630384727624202112975178512352005070771<39> × 1021643984512219628312433735932490548373814682368190642933348479203149650335905471952887<88> |