n!! - 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 127: | \[127!!-1\] | 27 × 353 × 1609 × 19181641 × 550245794922612939314801738703781<33> × 214704063373276972974175724083394534051224224095878693284149<60> |