Huh, I thought I was the only one playing this weird game in my head. I used to live in a country where license plates are all numeric digits. But with 4 digits

Huh, I thought I was the only one playing this weird game in my head. I used to live in a country where license plates are all numeric digits. But with 4 digits and my limited knowledge of math operations (I was a child), it was hard to find plates that "had solutions". So I gave myself a little wiggle room by imagining the numbers were written as they were on digital alarm clocks, where certain numbers (like {2,3,5} and {6,9}) required the same number of "bars" to represent [1]. I added a rule that the bars can be rearranged to form different numbers (e.g. 2, 3 and 5 can be rearranged as each other). Eventually, I added another rule that allowed the bars to be "concatenated," for example, "1" with two bars and "2" with 5 bars can be added to form "8", which requires 7 bars. [1] https://goo.gl/images/t2njyy https://goo.gl/images/t2njyy