I solved a problem that was new for me

I just checked my old, pre-language challenge Project Euler account. Turns out I had never solved problem 51 on there. I actually have missed a few in the 51-100 range, so, at long last, some of the problems I will be solving will be truly new to me (though to be honest, it had been so long since I had done most of the other problems that I hardly recalled anything).