Bill Allombert on Thu, 28 Aug 2025 19:59:37 +0200


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

On Thu, Aug 28, 2025 at 05:02:28PM +0200, hermann@stamm-wilbrandt.de wrote:
> @Bill, you once added primorial operator after first stating "not needed".
> 
> $ gp -q
> ? version
> [2, 16, 1]
> ? 7#
> 210
> ?
> 
> Are you in the mood of adding another operator (!!) to GP?

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

? 3!!
%1 = 720

Cheers,
Bill