n!!!!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
285: | \[285!!!!!+1\] | 131 × 1393255105186309<16> × 6723683639206207<16> × 2242529027955269777<19> × 54171823852911883105248461<26> × 1886310143993191085129926318393730331461<40> |