Search found 40 matches

by Katy729
Wed Dec 27, 2017 4:17 am
Forum: Number Theory
Topic: Integer
Replies: 1
Views: 162

Integer

Find all natural numbers $(a,b)$ such that
$\frac{b^2+a}{ab-1}$ in an integer.
by Katy729
Wed Dec 27, 2017 4:16 am
Forum: Number Theory
Topic: Integer
Replies: 1
Views: 95

Integer

Find all natural numbers $(a,b)$ such that
$\frac{b^2+a}{ab-1}$ in an integer.
by Katy729
Wed Dec 27, 2017 4:11 am
Forum: Site Support
Topic: Help me please
Replies: 1
Views: 175

Help me please

Since some days in this forum I see the post not clear, It means that I see only "$"
someone can resolve this problem? Another people have the same problem? :(
by Katy729
Thu Dec 14, 2017 8:54 pm
Forum: Number Theory
Topic: Prime numbers
Replies: 4
Views: 215

Prime numbers

For how many natural numbers $n$, both $n$ and $(n -6)^2 + 1$ are prime?
by Katy729
Wed Dec 13, 2017 11:18 pm
Forum: Number Theory
Topic: Yet divisibility...
Replies: 6
Views: 530

Re: Yet divisibility...

Ok, thanks aritra!! :)
by Katy729
Wed Dec 13, 2017 8:07 pm
Forum: Number Theory
Topic: Yet divisibility...
Replies: 6
Views: 530

Re: Yet divisibility...

A solution please..... :(
by Katy729
Sat Nov 11, 2017 4:08 pm
Forum: Number Theory
Topic: Yet divisibility...
Replies: 6
Views: 530

Re: Yet divisibility...

Please a solution... :( :( :(
by Katy729
Sat Oct 14, 2017 10:48 pm
Forum: Number Theory
Topic: Yet divisibility...
Replies: 6
Views: 530

Re: Yet divisibility...

Someone pleasee. :(
by Katy729
Mon Oct 02, 2017 3:00 pm
Forum: International Mathematical Olympiad (IMO)
Topic: IMO $2017$ P$1$
Replies: 4
Views: 776

Re: IMO $2017$ P$1$

Beautifull solution ahmedittihad!! :)
by Katy729
Fri Sep 15, 2017 3:11 am
Forum: International Mathematical Olympiad (IMO)
Topic: IMO $2017$ P$1$
Replies: 4
Views: 776

Re: IMO $2017$ P$1$

Please someone post a solution... :( :(