a) 5, 15, 125, 1235, ...
5, 15, 125, 1235, 12345, 123455, 1234565, 12345675
б) 1, 3, 9, 27, ...
1, 3, 9, 27, 81, 243, 729, 2187
Ответ: a) 5, 15, 125, 1235, 12345, 123455, 1234565, 12345675; б) 1, 3, 9, 27, 81, 243, 729, 2187.