n!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 178: | \[178!!+1\] | 2539 × 1619861 × 7535961700921<13> × 1968086907750539<16> × 51595026598058398866881170796783299<35> × 110021145948393142071392956738925350318401527<45> × 29509067421039359497457457734906583766530448937<47> |