n!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
165: | \[165!!+1\] | 24 × 167 × 307591091 × 252181256179702416907<21> × 37697433875332227847710902663333<32> × 3019892556085750405428479102637415778922770784068185923304559563234441663995174525023<85> |