n!! - 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
157: | \[157!!-1\] | 2 × 32674784308266796461131127233<29> × 230903200050161532086509673097157<33> × 2271219268005598974782748570851042557550807255575504395153639970353444714827027<79> |