n!! - 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 243: | \[243!!-1\] | 2 × 40241 × 32031953 × 1957997470587121291<19> × [5307675824855806559734832734485388018229299376835315347226957624699242058695927301740516347833041635588679044133944167288738608752933583711558557725621474004309418742210510535627209731063068894883289060094459<208>] |