n!!!!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 267: | \[267!!!!!+1\] | 5 × 105277008111983596380114271703731621702820547251005661402925133461252290484588982493394231526445978976308429<108> |