tables > factorial > f2-1

n!! - 1

Table

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

77: \[77!!-1\] 2 × 79 × 179 × 42407 × 269503321133<12> × 1307732496731<13> × 2389048854812593736165587<25>

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