Products, sums and divisors 2

How many integers x x are there such that, for all positive integers n n , x n x^n is divisible by n x nx ?


Clarification: We say that integer b b divides integer a a if there exists an integer c c such that a = b c a = bc .

Insipiration

Finite greater than one One Zero Infinite

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3 solutions

Trung Vu
Sep 5, 2017

The only value for x x is 0 \boxed{0} .

Let N = x n 1 n N = \frac{x^{n-1}}{n} , then when x x is 0:

N = 0 n N = \frac{0}{n}

Since for all n n , n 0 n | 0 , so we have the only value for x x

But when you divide 0 by n × 0 the result becomes undefined. How can you say that (/0^{n}/) is divisible by 0×n for all integers n??

Nishant Ranjan - 1 year, 5 months ago

Now it is by chance got the right answer but I actually have many reasons to believe its not; here's some which is proved by using some code:

If you look at the console at the right, you can already see two solutions why and the code and computer combined will keep going to kind as many solutions to this formula as possible; so the answer really is infinite.

I can prove this because you can still add zeroes to 6 or 8 like 6,60,600,etc or 8,80,800,etc and still keep the power 'n' the same (which is 2 in this case) and make an infinite amount of solutions

Tell me here in the comments if I have made any mistake

Anonymous1 Assassin - 4 months, 3 weeks ago

The answer must be x = 1 x=1 , for all n n ϵ \epsilon Z + \Z^+ , x n x^n is divisible by n x nx , i.e 1 5 1^5 is divisible by 5 1 5*1 .

no I think the person who made this problem messed up

Anonymous1 Assassin - 4 months, 3 weeks ago

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