A true random number generator  a hardware random number generator (HRNG) or true random number generator (TRNG)  is cryptographically secure and takes into account physical attributes such as atmospheric or thermal conditions. Such tools may also take into account measurement biases.

The most popular picks are in fact 69, 77 and 7 (in descending order). It's well known amongst purveyors of conjuring tricks and the like that if you ask people to pick a number between 1 and 10, far more people choose 7 than any other number.