n!!!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
247: | \[247!!!!+1\] | 2 × 683 × 4583 × 223963 × 2040944459148384826830047806957914689<37> × 67915717299672941980134309235332154513469049992117685534286158025867397881<74> |