n!!!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
284: | \[284!!!!+1\] | 6133 × 773125154918386470530738354826639302835354841327986747240229007007473164021856918342557914038024835266223956517399511390065892241969672264797<141> |