Quote:
Originally Posted by LaurV
...Your confusion may be because log in your case is assumed to be any base (like natural log). If you take base 10, log_{10}(10) is 1, so the last part is gone. Note that in windows calculator, log is base 10 (what we use in school to write like lg) and not base e (what we used in school to write like ln).

I think you are probably correct. Perhaps Windows calculator is not doing this correctly. It has "log" and "ln." I have always taken the first to mean base 10, and the second, base 2. Either way, I cannot get it to come up with a correct value based on what I have seen here.
Quote:
Originally Posted by kar_bon
You should also use the normalized form instead:
10*2^n1 = 5*2^(n+1)1, see here for those primes.

I looked. All of this seems to be locked in on 5, or perhaps, multiples of 5.
Quote:
Originally Posted by Dr Sardonicus
Siccing the mighty PariGP on the previous query,

This must be an expression calculator. I found a few online but none could return a value of any size.
I looked at some of the prime results posted above. I noticed some of them use composite numbers, like 231*2^
23352811. At first, I thought this would be selfdefeating, but then, I remembered some basics: Odd number * odd number is an odd number. Just in case, I steered around this. Below is a
PFGW ABC2 I had been experimenting with.
Code:
ABC2 $a*2^$b1
a: primes from 100 to 500
b: from 4256191 to 4256191
The "b" number is a natural from a long list I created with a simple
Perl script. Repeating it was the only way I could find to keep it static while being able to increment the "a." I was amazed at the different operator combinations I could use.
I want to thank all of you for your feedback so far. Most kind.