n!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
140: | \[140!!+1\] | 71 × 139 × 653 × 82721 × 718943 × 7577144258953<13> × 432323784232729709<18> × 37458552265450764501126498349<29> × 300706276878819196334032212518907615394621847<45> |