n!! - 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
156: | \[156!!-1\] | 5727509 × 265558861 × 2250213513335027429611893615343889891850435362226406939254807068647297979578771541087646798341145925898749261572640790844751<124> |