n!! - 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
151: | \[151!!-1\] | 23 × 30781 × 15525292002339843624320560695781952185156141<44> × 2407667277078254577183520903941708535054707484359291059602130717830252165168380697543<85> |