n!!!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
262: | \[262!!!!+1\] | 95388311 × 5977114551113496968129<22> × 54998250582557269849997654347<29> × 24663161752572130738632218559751<32> × 265631655351821993303198925856815379731907<42> |