tables > factorial > f2-1

n!! - 1

Table

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Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>

* 311: \[311!!-1\] 23 × 7713097753<10> × 32743295267<11> × [1524527573622031888802398527812826560210677853932207511092222610350328770920328384947877633248624424640055182871288293964229472181940597774056246656705761762396212277858536539841964789578201018902176029113049746319387854713773765892610084059916271942357615971682286120264666759110870620255424368800553<301>]

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