In my experience most people prefer the appearance of even numbers or numbers divisible by 5.
- Is there any research which proves or disproves my theory?
- Is it all about symmetry?
I expect that people prefer the number 5 because it is half of 10 and we live in a world that primarily uses a base-10 system. e.g. I like my gamerscore on xbox-live or reputation here to be even or divisible by 5.