n!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 171: | \[171!!+1\] | 22 × 12870696841<11> × 148346675119086467<18> × 36956039524820653598755711<26> × 12036864636953871500219183316713<32> × 33518679981054739833251531088228073587847435958599195160051317925797339<71> |