n!!!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
324: | \[324!!!!+1\] | 163 × 3203 × 44391043139<11> × 10551252902839871<17> × 30787288273702109306342007745487<32> × 4501493987000108944509108668958333065879368012967627960265643778286953287062151970526635287595842455820003<106> |