hermann on Wed, 27 Sep 2023 14:15:03 +0200


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Re: primorial operator '#' for GP? 

On 2023-09-25 10:09, Bill Allombert wrote:

Better do

? vecprod(primes([1,11]))
%1 = 2310


OK, I will use this for now:

? primorial(x)=vecprod(primes([1,x]));
? primorial(11)
%4 = 2310
?



Any chance to see "#" as operator in GP like "!"?
? 11#
  ***   syntax error, unexpected '#', expecting end of file: 11#
  ***                                                          ^-
I suppose we could add a primorial() function but adding a new operator would 
be a bit too much.


There are 160 matches for "#" in list of 5000 largest primes:
https://t5k.org/primes/lists/all.txt


 rank  description                     digits   who   year comment
----- ------------------------------- -------- ----- ---- -------------- 
...
  456  3267113#-1                       1418398 p301  2021 Primorial
...
 5740  113225039190926127209*2339#/57057+7
                                           1002 c88   2021 Septuplet (3)
...


I understand the "a bit too much" statement.
But it would be nice if just copying 2nd column "as is" would work in GP ... 


Regards,

Hermann.