n!!!!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
323: | \[323!!!!!+1\] | 211 × 178939 × 226403077 × 3620203628711250817679<22> × 4059300129460281250139653<25> × 22459967433800358729495017071251835362645784615425596023362016216874729639<74> |