A098783 - cp's OEIS frontend

A098783 Smallest integer not occurring earlier such that the concatenation of the integers has the property that the first two digits sum to 9, the next two digits also, etc.

n	a(n)
0	0
1	9
2	1
3	8
4	2
5	7
6	3
7	6
8	4
9	5
10	18
11	27
12	36
13	45
14	54
15	63
16	72
17	81
18	90
19	180
20	91
21	80
22	92
23	70
24	93
25	60
26	94
27	50
28	95
29	40
30	96
31	30
32	97
33	20
34	98
35	10
36	909
37	181
38	82
39	71
40	83
41	61
42	84
43	51
44	85
45	41
46	86
47	31
48	87
49	21
50	88
51	11
52	809
53	182
54	73
55	62
56	74
57	52
58	75
59	42
60	76
61	32
62	77
63	22
64	78
65	12
66	709
67	183
68	64
69	53
70	65

[0, 9, 1, 8, 2, 7, 3, 6, 4, 5, 18, 27, 36, 45, 54, 63, 72, 81, 90, 180, 91, 80, 92, 70, 93, 60, 94, 50, 95, 40, 96, 30, 97, 20, 98, 10, 909, 181, 82, 71, 83, 61, 84, 51, 85, 41, 86, 31, 87, 21, 88, 11, 809, 182, 73, 62, 74, 52, 75, 42, 76, 32, 77, 22, 78, 12, 709, 183, 64, 53, 65]

cp's OEIS Frontend

A098783 Smallest integer not occurring earlier such that the concatenation of the integers has the property that the first two digits sum to 9, the next two digits also, etc.

Table of values

List of values

n	a(n)
0	0
1	9
2	1
3	8
4	2
5	7
6	3
7	6
8	4
9	5
10	18
11	27
12	36
13	45
14	54
15	63
16	72
17	81
18	90
19	180
20	91
21	80
22	92
23	70
24	93
25	60
26	94
27	50
28	95
29	40
30	96
31	30
32	97
33	20
34	98
35	10
36	909
37	181
38	82
39	71
40	83
41	61
42	84
43	51
44	85
45	41
46	86
47	31
48	87
49	21
50	88
51	11
52	809
53	182
54	73
55	62
56	74
57	52
58	75
59	42
60	76
61	32
62	77
63	22
64	78
65	12
66	709
67	183
68	64
69	53
70	65

n	a(n)
0	0
1	9
2	1
3	8
4	2
5	7
6	3
7	6
8	4
9	5
10	18
11	27
12	36
13	45
14	54
15	63
16	72
17	81
18	90
19	180
20	91
21	80
22	92
23	70
24	93
25	60
26	94
27	50
28	95
29	40
30	96
31	30
32	97
33	20
34	98
35	10
36	909
37	181
38	82
39	71
40	83
41	61
42	84
43	51
44	85
45	41
46	86
47	31
48	87
49	21
50	88
51	11
52	809
53	182
54	73
55	62
56	74
57	52
58	75
59	42
60	76
61	32
62	77
63	22
64	78
65	12
66	709
67	183
68	64
69	53
70	65

n	a(n)
0	0
1	9
2	1
3	8
4	2
5	7
6	3
7	6
8	4
9	5
10	18
11	27
12	36
13	45
14	54
15	63
16	72
17	81
18	90
19	180
20	91
21	80
22	92
23	70
24	93
25	60
26	94
27	50
28	95
29	40
30	96
31	30
32	97
33	20
34	98
35	10
36	909
37	181
38	82
39	71
40	83
41	61
42	84
43	51
44	85
45	41
46	86
47	31
48	87
49	21
50	88
51	11
52	809
53	182
54	73
55	62
56	74
57	52
58	75
59	42
60	76
61	32
62	77
63	22
64	78
65	12
66	709
67	183
68	64
69	53
70	65