n!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 125: | \[125!!+1\] | 28 × 35803 × 24022934345639<14> × 2169506594081504477959<22> × 2715647147782632370517216671472604662790251022623030327124898457<64> |