n!! - 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 173: | \[173!!-1\] | 2 × 1126711 × 222352808044440559<18> × 9223396534730909605515671357636474444957<40> × 4262806803402523952326653771763508813900307669646040486280087391250079775224399105819270120659<94> |