An algorithm to display tree structure.
质数:(质数±1)因数随机组合
非质数:因数随机组合
Case1: 2*3+1
Case2: 3*2+1
Case3: 1*7
Case4: 7*1
Case5: 222-1
Case6: 24-1 (=23+1)
Case7: 4*2-1
Case1: 1*8
Case2: 8*1
Case3: 222
Case4: 2*4
Case5: 4*2
Case6: 3*3-1
Case1: 222+1
Case2: 2*4+1
Case3: 4*2+1
Case4: 1*9
Case5: 9*1
Case6: 3*3
Case7: 25-1 (=24+1)
Case8: 5*2-1
Case1: 3*3+1
Case2: 1*10
Case3: 10*1
Case4: 2*5
Case5: 5*2