n!! - 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 131: | \[131!!-1\] | 2 × 443 × 309403 × 1571687801 × 115793253431361950791<21> × 167895135590824244459287757<27> × 332382833012760694658505766226474585216633076419<48> |