n!! - 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 249: | \[249!!-1\] | 24 × 251 × 439 × 1208423 × 2158994063 × 30436710794339<14> × 2883597941637667856523047230497978615505104853633777605989678241937150539601773940729350757060614635409549370116160726901725552836208647258703772831955565434046113156846831566171803287622349134650112214292010991<211> |