n!! - 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 231: | \[231!!-1\] | 23 × 18387169124568719<17> × 63525517506891001<17> × 1858926938527599599<19> × [8491608401918433256511952391391395936788582385511226959576811231487735012565705513192976353762090550079657555197298171351168768560263100188719373259727020598138903869128113<172>] |