n!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
157: | \[157!!+1\] | 26 × 179282871838716871<18> × 119713324063925346679<21> × 37291191837094787842933<23> × 669058685152769179745309885981688199591954887911989931589468566412061877494747<78> |