[1,1,2,2,3,2,4,3,4,5,2,4,6,4,6,7,2,5,6,8,4,7,8,9, 3,5,7,9,10,4,6,8,10,11,2,4,8,10,12,6,9,11,12,13,2, 6,8,11,13,14,4,6,10,12,14,15,4,8,10,13,15,16,5,7, 9,11,13,15,17,2,4,7,10,12,14,16,17,18]