An RNG that runs in your brain

Humans are notoriously bad at coming up with random numbers. I wanted to be able to quickly generate “random enough” numbers. I’m not looking for anything that great, I just want to be able to come up with the random digits in half a minute. Some looking around brought me to an old usenet post by George Marsaglia: Choose a 2-digit number, say 23, your “seed”. Form a new 2-digit number: the 10’s digit plus 6 times the units digit....