n!!!!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
320: | \[320!!!!!+1\] | 677 × 47313151 × 44369983136183728913599091<26> × 4630183727112137248980048949427015186705232180721<49> × 10452956562857496746549280274692711104742443050033<50> |