n!!!!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
297: | \[297!!!!!+1\] | 28181 × 5604130691<10> × 598717778639<12> × 291554046314071<15> × 43902987914372561035733447<26> × 229997204290266900816823239923136728995208582829711879409<57> |