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Instead of

if ( x * y == P)

if (x % y ==0)

or

Sorry you are correct I am missing a few 5s

If we take total pixels P = 480000 for example

Then in C

int x,y;


for (x = sqrt(P); x > 0; x--){

Not a programming solution as such but a simple math based approach.

You know the number of pixels in the image say

p = 480000

Now factorise it

p = 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 3 x 5