n!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 126: | \[126!!+1\] | 127 × 281 × 7993 × 10363953188310911225937682968419<32> × 141939980993475455263924160135887<33> × 43578934833043058978313161779611787<35> |