A289287 - cp's OEIS frontend

A289287 Starting with a(1) = 1, a(n) = smallest nonnegative integer not yet in the sequence such that the last digit of a(n-1) plus the first digit of a(n) is equal to 9. The digit 0 is not allowed.

n	a(n)
1	1
2	8
3	11
4	81
5	82
6	7
7	2
8	71
9	83
10	6
11	3
12	61
13	84
14	5
15	4
16	51
17	85
18	41
19	86
20	31
21	87
22	21
23	88
24	12
25	72
26	73
27	62
28	74
29	52
30	75
31	42
32	76
33	32
34	77
35	22
36	78
37	13
38	63
39	64
40	53
41	65
42	43
43	66
44	33
45	67
46	23
47	68
48	14
49	54
50	55
51	44
52	56
53	34
54	57
55	24
56	58
57	15
58	45
59	46
60	35
61	47
62	25
63	48
64	16
65	36
66	37
67	26
68	38
69	17
70	27
71	28
72	18
73	19

[1, 8, 11, 81, 82, 7, 2, 71, 83, 6, 3, 61, 84, 5, 4, 51, 85, 41, 86, 31, 87, 21, 88, 12, 72, 73, 62, 74, 52, 75, 42, 76, 32, 77, 22, 78, 13, 63, 64, 53, 65, 43, 66, 33, 67, 23, 68, 14, 54, 55, 44, 56, 34, 57, 24, 58, 15, 45, 46, 35, 47, 25, 48, 16, 36, 37, 26, 38, 17, 27, 28, 18, 19]

cp's OEIS Frontend

A289287 Starting with a(1) = 1, a(n) = smallest nonnegative integer not yet in the sequence such that the last digit of a(n-1) plus the first digit of a(n) is equal to 9. The digit 0 is not allowed.

Table of values

List of values

n	a(n)
1	1
2	8
3	11
4	81
5	82
6	7
7	2
8	71
9	83
10	6
11	3
12	61
13	84
14	5
15	4
16	51
17	85
18	41
19	86
20	31
21	87
22	21
23	88
24	12
25	72
26	73
27	62
28	74
29	52
30	75
31	42
32	76
33	32
34	77
35	22
36	78
37	13
38	63
39	64
40	53
41	65
42	43
43	66
44	33
45	67
46	23
47	68
48	14
49	54
50	55
51	44
52	56
53	34
54	57
55	24
56	58
57	15
58	45
59	46
60	35
61	47
62	25
63	48
64	16
65	36
66	37
67	26
68	38
69	17
70	27
71	28
72	18
73	19

n	a(n)
1	1
2	8
3	11
4	81
5	82
6	7
7	2
8	71
9	83
10	6
11	3
12	61
13	84
14	5
15	4
16	51
17	85
18	41
19	86
20	31
21	87
22	21
23	88
24	12
25	72
26	73
27	62
28	74
29	52
30	75
31	42
32	76
33	32
34	77
35	22
36	78
37	13
38	63
39	64
40	53
41	65
42	43
43	66
44	33
45	67
46	23
47	68
48	14
49	54
50	55
51	44
52	56
53	34
54	57
55	24
56	58
57	15
58	45
59	46
60	35
61	47
62	25
63	48
64	16
65	36
66	37
67	26
68	38
69	17
70	27
71	28
72	18
73	19

n	a(n)
1	1
2	8
3	11
4	81
5	82
6	7
7	2
8	71
9	83
10	6
11	3
12	61
13	84
14	5
15	4
16	51
17	85
18	41
19	86
20	31
21	87
22	21
23	88
24	12
25	72
26	73
27	62
28	74
29	52
30	75
31	42
32	76
33	32
34	77
35	22
36	78
37	13
38	63
39	64
40	53
41	65
42	43
43	66
44	33
45	67
46	23
47	68
48	14
49	54
50	55
51	44
52	56
53	34
54	57
55	24
56	58
57	15
58	45
59	46
60	35
61	47
62	25
63	48
64	16
65	36
66	37
67	26
68	38
69	17
70	27
71	28
72	18
73	19