n!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 138: | \[138!!+1\] | 139 × 757 × 860649071 × 2609935418764137907637428536286661<34> × 427376020965531452701586822161464388620064310029241011747624969843400677<72> |