Если a = 3:
3 ⋅ 34 + 397 = 102 + 397 = 499
Если a = 5:
5 ⋅ 34 + 397 = 170 + 397 = 567
Если a = 7:
7 ⋅ 34 + 397 = 238 + 397 = 635
Ответ: 499, 567, 635