n!! - 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
175: | \[175!!-1\] | 24 × 198240751 × 19300085239<11> × 494231104613<12> × 284776895477383<15> × 84920646123617011009<20> × 24166596426444368611193731214174856143<38> × 194972777548304821192836683650649122351866810262372980287<57> |