n!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
137: | \[137!!+1\] | 2 × 14557 × 1063547 × 209147921 × 2497448944357<13> × 237542995632200221<18> × 2694226504063180159267015161419<31> × 661615068738454789219774164841453449349<39> |