n!!!!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 209: | \[209!!!!!+1\] | 181 × 365604552546781<15> × 8999585051962171<16> × 358402155200841094487<21> × 607605010180340166396786821<27> |