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Forum: gophne 2018-01-07, 09:24
Replies: 272
Views: 36,553
Posted By 10metreh
I don't think you've taken on board what axn...

I don't think you've taken on board what axn meant by this:



The point is that, if n is odd, then gcd(n, n+2N) = gcd(n, N) and so you are just checking if n has any common factors with N. But...
Forum: gophne 2018-01-06, 10:39
Replies: 272
Views: 36,553
Posted By 10metreh
CRGreathouse has answered most of the questions...

CRGreathouse has answered most of the questions so there isn't much more for me to say.



According to the Prime Pages (http://primes.utm.edu/glossary/xpage/Fermat.html), Fermat noticed that 2p...
Forum: gophne 2018-01-05, 23:17
Replies: 272
Views: 36,553
Posted By 10metreh
Gophne, as actual proofs don't seem to have...

Gophne, as actual proofs don't seem to have persuaded you, let's have a look at an example to see that the two tests are the same. I'm going to avoid modular arithmetic as much as possible because it...
Forum: gophne 2017-12-31, 19:25
Replies: 272
Views: 36,553
Posted By 10metreh
"mod" isn't an operator. You can't just apply it...

"mod" isn't an operator. You can't just apply it to one side of an equation. It isn't the same as the "%" operator in many programming languages, though it is somewhat similar.

When we say that a...
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