n!!!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 421: | \[421!!!!+1\] | 2 × 787 × 853 × 2411 × 8516803 × [228285095781785919431490064846525811219559455349504511776703303117008437813649034538808159147577177065255402814908552964008445684453601176054891587839845551916894219311755529677387783591017601152012880657559802880101<216>] |