n!! - 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 280: | \[280!!-1\] | 151 × 283 × 10372619570340359803<20> × 67401641613229163209<20> × [628039667175298100973582127770684135024725674431057394529953366532658374248958595215873864527562630297219378556986513802973343911031094234688243460670314015420891123076214603844231880291873402603522124030124642388711841535559026622327744089<240>] |