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3:00 PM
The primes are already listed in OEIS but I think the searching range is not very deep there.
No more PRP's for $f(n)+1$ with $n \le 597$.
 
@TeresaLisbon My new project revealed no further prime numbers upto $n=600$. Did you also enter the numbers in factordb ?
 
@Peter No, but I will do so when I get time. No time today, unfortunately.
I can create the program in no time, but it's the writing of the results and presenting them to you that might take some time.
 
3:16 PM
3 messages moved from CURED
@MartinHopf That is depressing. Someone actually had this idea before :( The search limit is far better than mine. The numbers are very large already at this level.
gp > prod(j=1,597,fibonacci(j))*1.0
%1 = 2.3278472864322190358117690259389775665 E37096
gp >
 
I'm searching with PFGW at the moment, Maybe there is a small chance that we find a PRP for say $n \le 1000$.
 
How could you implement that there ?
 
I simply write the big numbers in a textfile with Pari/GP and then test them with PFGW. One Line per Number.
 
Ah, OK. And that works for such monsters ? I am impressed.
I created a routine to generate the products and copy it into factordb. This is another option.
 
I'm not sure how long a line in a textfile can be, but we will see.
 
3:26 PM
$n = 1\ 000$ still worked.
 
Interesting, so factordb will do the PRP-test.
 
We only have to assign the numbers (not too many per hour). Upto $150$ k digits, they can be tested although this could take very long.
for n = 1000 for example both numbers are composite
for n = 999 both numbers are assigned
 
4:05 PM
@MartinHopf Do you search both types simultaneously ?
 
No
$n=727$ now.
 
Not bad ! + or - ?
 

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