n!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 121: | \[121!!+1\] | 2 × 24693371124817<14> × 1708418434674521307502957602625595444017045116701937456139664278995817738011473752024889<88> |