. . 2



1. , .

2. . .5.1 n-1 , n . , .

 

⠠ 5.1

an

an-1

0

1

2

3

4

5

6

7

8

9

0

1,5,9,

13,16

2,6,10,

14,17

3,7,11,

15,18

4,8,12,

13,19

1,9,11,

14,20

2,10,12,

15,18

3,5,8,

13,17

4,6,7,

14,19

1,8,10,

13,17

2,5,7,

14,18

1

3,6,8,

15,19

4,7,9,

13,16

1,5,12,

14,20

2,6,11,

15,16

3,7,10,

13,17

4,8,9,

14,18

1,7,12,

13,18

2,8,10,

14,19

3,5,11,

15,20

4,6,9,

13,17

2

2,7,9,

13,20

1,8,11,

15,19

4,5,10,

15,17

3,6,12,

14,16

1,5,9,

13,16

2,6,10,

14,17

3,7,11,

15,18

4,8,12,

13,19

1,9,11,

14,20

2,10,12,

15,18

3

3,5,8,

13,17

4,6,7,

14,19

1,8,10,

13,17

2,5,7,

14,18

3,6,8,

15,19

4,7,9,

13,16

1,5,12,

14,20

2,6,11,

15,16

3,7,10,

13,17

4,8,9,

14,18

4

1,7,12,

13,18

2,8,10,

14,19

3,5,11,

15,20

4,6,9,

13,17

2,7,9,

13,20

1,8,11,

15,19

4,5,10,

15,17

3,6,12,

14,16

1,5,9,

13,16

2,6,10,

14,17

5

3,7,11,

15,18

4,8,12,

13,19

1,9,11,

14,20

2,10,12,

15,18

3,5,8,

13,17

4,6,7,

14,19

1,8,10,

13,17

2,5,7,

14,18

3,6,8,

15,19

4,7,9,

13,16

6

1,5,12,

14,20

2,6,11,

15,16

3,7,10,

13,17

4,8,9,

14,18

1,7,12,

13,18

2,8,10,

14,19

3,5,11,

15,20

4,6,9,

13,17

2,7,9,

13,20

1,8,11,

15,19

7

4,5,10,

15,17

3,6,12,

14,16

1,5,9,

13,16

2,6,10,

14,17

3,7,11,

15,18

4,8,12,

13,19

1,9,11,

14,20

2,10,12,

15,18

3,5,8,

13,17

4,6,7,

14,19

8

1,8,10,

13,17

2,5,7,

14,18

3,6,8,

15,19

4,7,9,

13,16

1,5,12,

14,20

2,6,11,

15,16

3,7,10,

13,17

4,8,9,

14,18

1,7,12,

13,18

2,8,10,

14,19

9

3,5,11,

15,20

4,6,9,

13,17

2,7,9,

13,20

1,8,11,

15,19

4,5,10,

15,17

3,6,12,

14,16

1,5,9,

13,16

2,6,10,

14,17

3,7,11,

15,18

4,8,12,

13,19