I also went to store and machine would not accept 777 did not know lottery could do that .I thought if you paid for ticket  it was acceptable/ 

That number sells out pretty fast

The best time to get them is the nite before, good luck:)

The same thing hapen to me about a month ago. I tried playing 1111 and the store would not let me played that particular number. I went to 3 other stores within 20min trying to play that number and the machines kept rejecting it. LOL......It kinda feak me out because I was positive that' number was going to fall that evening......It didnt. I didnt know the lottery could reject numbers if to many played it.