n!! - 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 218: | \[218!!-1\] | 677 × 25940923 × 392855936069<12> × 40025352732194087<17> × 228554449492852447641846391<27> × [1484780398789124663046319749034069860171533558537356152499852722123645425694108718718393895109622653922571375199039557361070602980714176049413653<145>] |