n!!!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
297: | \[297!!!!+1\] | 2 × 683 × 1467274711381607599<19> × 330935154922780592554752160489<30> × 577012932033160793603447393498395161310772304726942575487206638084180979660438825971611137792271837451<102> |