Re: PARI/GP wrong on 7!!+7+1 being not prime, or oeis.org/Mathematica?

James Cloos <[email protected]> Thu, 28 Aug 2025 14:37:46 -0400

Newsgroups	gmane.comp.mathematics.pari.user
Message-ID	<[email protected]>

BA> Adding this one would break backward compatibility, so this is not
BA> an option.

does pari have a generalized factorial function?

maxima's doc notes this:

     For an argument ‘n’ which is not an integer, float, or rational,
     ‘n!!’ yields a noun form ‘genfact (n, n/2, 2)’.

perhaps pari's docs could suggest using such a generalized factorial
when a double factorial is desired?

-JimC
-- 
James Cloos <[email protected]>
            OpenPGP: https://jhcloos.com/0x997A9F17ED7DAEA6.asc