n!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 309: | \[309!!+1\] | 24 × 311 × 15619 × 1794712296563<13> × 8362835292915989<16> × 115291667969130941<18> × 73643801862633917576317377066698500093299398803853940895411428629035127204269611137572467854709452121362156857937553162662441047347963343583096251511428984215691948672393588219537806046507339192669894417051461750313098064228480300567666564987675246135927072692207517<266> |