n!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 221: | \[221!!+1\] | 26 × 223 × 219557606372593<15> × [78128830496188760604944374637885383256233925381605155182799664004911462488863511347536530540462634881453288815886503744567552410981594319866705167227525436447456005309765357988473522838421091731<194>] |