I suspect this is what Atom Dude meant by the inspiring claim, but that claim's wording was too general. He may also have been referring to computer-generated pseudorandom numbers, but I don't know enough about that topic to comment on it.
When you ask a person to pick a random number, they'll usually choose an odd number that doesn't end in 5. As a side-effect, many human-generated random numbers are prime. This is why humans are a horrible source of random numbers.
Discussion (5)
Incidentally, odd numbers have been statistically shown to be easier to remember. Many also believe that stories are more believable when odd numbers are used: "Yeah man, we were going like 93 when the cop saw us!"
Odd numbers are also less likely to get you audited by the IRS.
This sounds like a good use for Amazon's Mechanical Turk.
I will pay you $0.003 to pick a "random" number between 1 and 100.
$5 will get you like 1600+ numbers.
Human generated random numbers usually end with 3
please tag "psychology"