A298979 - cp's OEIS frontend

A298979 Lexicographic first sequence of positive integers such that a(n)*a(n+1) has a digit 9, and no term occurs twice.

n	a(n)
1	1
2	9
3	10
4	19
5	5
6	18
7	11
8	27
9	7
10	13
11	3
12	23
13	4
14	24
15	8
16	12
17	16
18	6
19	15
20	26
21	35
22	14
23	21
24	29
25	17
26	37
27	25
28	36
29	22
30	41
31	34
32	28
33	32
34	30
35	31
36	39
37	46
38	2
39	45
40	20
41	47
42	42
43	38
44	50
45	58
46	33
47	43
48	44
49	59
50	49
51	40
52	48
53	52
54	56
55	53
56	55
57	54
58	61
59	64
60	62
61	63
62	57
63	51
64	69
65	68
66	72
67	82
68	60
69	65
70	66
71	75
72	79
73	67
74	70
75	71
76	76
77	78
78	73
79	81
80	74
81	77
82	83
83	84
84	88
85	90
86	91
87	87
88	80
89	99

[1, 9, 10, 19, 5, 18, 11, 27, 7, 13, 3, 23, 4, 24, 8, 12, 16, 6, 15, 26, 35, 14, 21, 29, 17, 37, 25, 36, 22, 41, 34, 28, 32, 30, 31, 39, 46, 2, 45, 20, 47, 42, 38, 50, 58, 33, 43, 44, 59, 49, 40, 48, 52, 56, 53, 55, 54, 61, 64, 62, 63, 57, 51, 69, 68, 72, 82, 60, 65, 66, 75, 79, 67, 70, 71, 76, 78, 73, 81, 74, 77, 83, 84, 88, 90, 91, 87, 80, 99]

cp's OEIS Frontend

A298979 Lexicographic first sequence of positive integers such that a(n)*a(n+1) has a digit 9, and no term occurs twice.

Table of values

List of values

n	a(n)
1	1
2	9
3	10
4	19
5	5
6	18
7	11
8	27
9	7
10	13
11	3
12	23
13	4
14	24
15	8
16	12
17	16
18	6
19	15
20	26
21	35
22	14
23	21
24	29
25	17
26	37
27	25
28	36
29	22
30	41
31	34
32	28
33	32
34	30
35	31
36	39
37	46
38	2
39	45
40	20
41	47
42	42
43	38
44	50
45	58
46	33
47	43
48	44
49	59
50	49
51	40
52	48
53	52
54	56
55	53
56	55
57	54
58	61
59	64
60	62
61	63
62	57
63	51
64	69
65	68
66	72
67	82
68	60
69	65
70	66
71	75
72	79
73	67
74	70
75	71
76	76
77	78
78	73
79	81
80	74
81	77
82	83
83	84
84	88
85	90
86	91
87	87
88	80
89	99

n	a(n)
1	1
2	9
3	10
4	19
5	5
6	18
7	11
8	27
9	7
10	13
11	3
12	23
13	4
14	24
15	8
16	12
17	16
18	6
19	15
20	26
21	35
22	14
23	21
24	29
25	17
26	37
27	25
28	36
29	22
30	41
31	34
32	28
33	32
34	30
35	31
36	39
37	46
38	2
39	45
40	20
41	47
42	42
43	38
44	50
45	58
46	33
47	43
48	44
49	59
50	49
51	40
52	48
53	52
54	56
55	53
56	55
57	54
58	61
59	64
60	62
61	63
62	57
63	51
64	69
65	68
66	72
67	82
68	60
69	65
70	66
71	75
72	79
73	67
74	70
75	71
76	76
77	78
78	73
79	81
80	74
81	77
82	83
83	84
84	88
85	90
86	91
87	87
88	80
89	99

n	a(n)
1	1
2	9
3	10
4	19
5	5
6	18
7	11
8	27
9	7
10	13
11	3
12	23
13	4
14	24
15	8
16	12
17	16
18	6
19	15
20	26
21	35
22	14
23	21
24	29
25	17
26	37
27	25
28	36
29	22
30	41
31	34
32	28
33	32
34	30
35	31
36	39
37	46
38	2
39	45
40	20
41	47
42	42
43	38
44	50
45	58
46	33
47	43
48	44
49	59
50	49
51	40
52	48
53	52
54	56
55	53
56	55
57	54
58	61
59	64
60	62
61	63
62	57
63	51
64	69
65	68
66	72
67	82
68	60
69	65
70	66
71	75
72	79
73	67
74	70
75	71
76	76
77	78
78	73
79	81
80	74
81	77
82	83
83	84
84	88
85	90
86	91
87	87
88	80
89	99