Maybe "go-to" is the wrong word. It's just that those are the digits I remember off the top of my head. I don't remember whether I made an actual effort to memo

Maybe "go-to" is the wrong word. It's just that those are the digits I remember off the top of my head. I don't remember whether I made an actual effort to memorize them as a kid, it's been over twenty years. But they stuck and are not easy to forget now.