n!!!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
206: | \[206!!!!+1\] | 8010876787<10> × 15437997231076197153814284436018038287039<41> × 1032467432254618928647489019113945979336860311557<49> |