n!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 249: | \[249!!+1\] | 2 × 16811 × 307873 × 727950383 × 113125373006363<15> × 10273085190039107518044991169<29> × [46100245653589050398982077028990973892786456452358312289718757889697824813125569805565094681061773907097491150387541116970288429699923753483406637638932870254019253627399772037567485871<185>] |