What is the next number in the sequence: 2, 1, 4, 3, 7, 6, 8, 13, _? 
What is the next number in the sequence: 1, 2, 2,4, 2,4, 2, 4, 6, 2, 6, 4?
מהו המספר הבא ברצף: 2, 1, 4, 3, 7, 6, 8, 13, _?
מהו המספר הבא ברצף: 1, 2, 2,4, 2,4, 2, 4, 6, 2, 6, 4?