n!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 151: | \[151!!+1\] | 2 × 167 × 3158712373815478118063683083552683753<37> × 8724738335113801927154029548384603434594009971363385154991321373350177827156743181101557242563<94> |