Thank you.
On Friday, May 8, 2020 at 2:13:57 PM UTC-7, u220e wrote:
>
>
>
> Hi. I'm trying to generate a list of pairs of primes (x,y) within a range
> of values such that the digit length of their products is between 19 and
> 35. I've written a few different code variations that (unfortunately)
> either (1) generate ALL the integer pairs (that equal 19, 20, 21, etc.) or
> (2) never seem to halt.
>
> I really want the iteration to be as follows: find the first pair that
> equals 19, then locate the first pair that equals 20, and so on so until I
> have one list of 17 pairs of primes---one pair for each digit length.
> Here's what I have so far:
>
> x=var('x')
> y=var('y')
> for x in sxrange (10**9,10**(36)):
> for y in sxrange (961748941,982451653):
> if x.is_prime()==1 and y.is_prime()==1:
> if (floor(log((x*y),10)+1)<=35)==1:
> print(x,y); print(floor(log((x*y),10)+1); break
>
> Then I tried defining y=982451653 so I could use only one iterable using
> the following code:
>
> for x in sxrange (10**9,10**(36)):
> if x.is_prime()==1:
> if (floor(log((x*y),10)+1)>=19)==1:
> continue
> print(x,y); print(floor(log((x*y),10)+1); break
>
> which returns only one value:
>
> 1000000007 982451653
> 18
>
> Sorry for the n00b post. I've only been using Sage for three days.
>
> Thanks,
>
> David
>
>
>
>
>
>
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