5.1
10:09:24
12:21:12
14:18:10
23:18:20

5.2
7  palindromw
03:44:30
04:22:40
10:33:01
12:00:21
12:22:21
13:33:31
23:44:32

5.3
12:12:13 
12:12:16

5.4
0	175
1	289
2	324
3	308
4	163
10	273
11	657
12	650
13	604
14	276
20	139
21	328
22	332
23	326