n!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 220: | \[220!!+1\] | 223 × 1877 × 607883513 × 1259366284778256179147608253<28> × [64339192400839045003064040642609124769216361317597569970479849339777790047866336060873421782947321270133153030650472491691277899093511573978272706768949008390141958077079<170>] |