I've heard this too, but have never heard any statiatical, or scientific proof to back it up, I personaly suspect that the first person that said it, had a 50/50 chance of being right, and stated what he preceaved, from his own build, and everyone after that just repeated what he said. I could be wrong, and am willing to listen to an argument of how Ohms law may react difrentley with a odd or even number, or stastical data on the accuracy of a calculator, compairing even to odd input.  

odd