n!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
154: | \[154!!+1\] | 2235630336448734243129271249<28> × 9813540372873403412645701623173904480465740521424105438595512969007936165328674394021182437194681374622291249<109> |