n!! - 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 273: | \[273!!-1\] | 25 × 1097 × 7639 × 4238511200437483<16> × [37004926687012363042475886180262228719215026599676023877240604722201854459851284799405179107825437459474801991532623884074966407315116167488121179666749060535142972083220915941068602887894497931194502608351683488900474180150922385009999586076788509813<251>] |