n!! - 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 239: | \[239!!-1\] | 24 × 487 × 16139 × 40581337 × 111006826877<12> × 2265915600581347772006882971<28> × 356393720998514456809559640830296026316334550417896450760648653951771909592549687187807709983630042055953923035208346116424473615551647271910618459216705955368952132151041904414237<180> |