Well, anything’s better than wearing 17, isn’t it? (That was a joke, btw – but, as Twitter user (づ｡◕‿‿◕｡)づ points out, the answer could be 3 or 13, depending on whether it’s six multiplied by five and then subtracting four, or taking four from five – one – and then dividing by six).
Edit: See comments for the debunking of that theory.
As this article explains, Romania fares badly in terms of school dropouts, so this initiative – used in the warm-up ahead of the game against Spain on Sunday night – aims to bring awareness to the problem.
It’s not the ‘real’ kind of squad-number subject matter we’re normally interested in, but it’s creative and it’s for the greater good, so it’s alright by us – especially as Romania had seven 1-11 numbers playing during the game itself, when FIFA rules meant they had to go conventional.