N = 1: no solution
N = 2: 22 2.2 "two" 222 - 222
N = 3: 33 3.3 "three" 222 - 223
N = 4: no solution
N = 5: 55 5.5 "five" 222 - 225
N = 6: 66 6.6 "six" 222 - 226
N = 7: 77 7.7 "seven" 222 - 227