n!!!!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 281: | \[281!!!!!+1\] | 56911 × 7505851123425049169<19> × 1093123816435571054274637643<28> × 5158997630522567962579426303718751620335323293958556419975612061<64> |