Number Players

I was playing roblox high school for hours and hours. When i closed the game, i found a ton of friend requests that were only numbers, all of them had no gear, no faces, no anything. They were all the same value of numbers but not the same name. I tried clicking on one of them, he had no friends, no followers, not even following one person, and so for all of them. I ignored all the friend requests. I told my brother about them and he said "I had the same thing too" i was shocked, he also said " i tried to accept them to see what is going on but they were all banned". I started to freak out, i tried searching one of them.....i finally found one, and he wasn't banned this time. I clicked on him. He had nothing in his inventory, he looked new, but the account was created on 5/10/2014. He was all white. I found his game. It was the same name as his username, 12345678924681025122. I clicked on the game, no game passes, no players, no visits, i was the only one to visit this game. I played the game...and i was literally in the middle of nowhere, just flat grass. When i clicked out of the game, I have never heard of those players again...