n!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
150: | \[150!!+1\] | 12323 × 203743394533132626499<21> × 1368313399791225065932359476162247029717<40> × 272819766451203862983728876536729614780041654397952050201389200871989<69> |