A298974 - cp's OEIS frontend

A298974 Lexicographic first sequence of positive integers such that a(n)*a(n+1) has a digit 4, and no term occurs twice.

n	a(n)
1	1
2	4
3	6
4	7
5	2
6	12
7	17
8	20
9	21
10	14
11	3
12	8
13	5
14	9
15	16
16	15
17	23
18	18
19	13
20	11
21	22
22	19
23	24
24	10
25	34
26	26
27	29
28	36
29	39
30	32
31	27
32	35
33	40
34	31
35	37
36	38
37	28
38	30
39	47
40	42
41	44
42	33
43	43
44	48
45	50
46	49
47	46
48	51
49	54
50	41
51	45
52	52
53	57
54	25
55	56
56	58
57	53
58	65
59	62
60	55
61	59
62	60
63	64
64	61
65	63
66	66
67	67
68	68
69	69
70	70
71	71
72	74
73	73
74	75
75	72
76	76
77	79
78	82
79	77
80	84
81	81
82	80
83	78
84	83
85	88
86	85
87	97
88	86
89	87

[1, 4, 6, 7, 2, 12, 17, 20, 21, 14, 3, 8, 5, 9, 16, 15, 23, 18, 13, 11, 22, 19, 24, 10, 34, 26, 29, 36, 39, 32, 27, 35, 40, 31, 37, 38, 28, 30, 47, 42, 44, 33, 43, 48, 50, 49, 46, 51, 54, 41, 45, 52, 57, 25, 56, 58, 53, 65, 62, 55, 59, 60, 64, 61, 63, 66, 67, 68, 69, 70, 71, 74, 73, 75, 72, 76, 79, 82, 77, 84, 81, 80, 78, 83, 88, 85, 97, 86, 87]

cp's OEIS Frontend

A298974 Lexicographic first sequence of positive integers such that a(n)*a(n+1) has a digit 4, and no term occurs twice.

Table of values

List of values

n	a(n)
1	1
2	4
3	6
4	7
5	2
6	12
7	17
8	20
9	21
10	14
11	3
12	8
13	5
14	9
15	16
16	15
17	23
18	18
19	13
20	11
21	22
22	19
23	24
24	10
25	34
26	26
27	29
28	36
29	39
30	32
31	27
32	35
33	40
34	31
35	37
36	38
37	28
38	30
39	47
40	42
41	44
42	33
43	43
44	48
45	50
46	49
47	46
48	51
49	54
50	41
51	45
52	52
53	57
54	25
55	56
56	58
57	53
58	65
59	62
60	55
61	59
62	60
63	64
64	61
65	63
66	66
67	67
68	68
69	69
70	70
71	71
72	74
73	73
74	75
75	72
76	76
77	79
78	82
79	77
80	84
81	81
82	80
83	78
84	83
85	88
86	85
87	97
88	86
89	87

n	a(n)
1	1
2	4
3	6
4	7
5	2
6	12
7	17
8	20
9	21
10	14
11	3
12	8
13	5
14	9
15	16
16	15
17	23
18	18
19	13
20	11
21	22
22	19
23	24
24	10
25	34
26	26
27	29
28	36
29	39
30	32
31	27
32	35
33	40
34	31
35	37
36	38
37	28
38	30
39	47
40	42
41	44
42	33
43	43
44	48
45	50
46	49
47	46
48	51
49	54
50	41
51	45
52	52
53	57
54	25
55	56
56	58
57	53
58	65
59	62
60	55
61	59
62	60
63	64
64	61
65	63
66	66
67	67
68	68
69	69
70	70
71	71
72	74
73	73
74	75
75	72
76	76
77	79
78	82
79	77
80	84
81	81
82	80
83	78
84	83
85	88
86	85
87	97
88	86
89	87

n	a(n)
1	1
2	4
3	6
4	7
5	2
6	12
7	17
8	20
9	21
10	14
11	3
12	8
13	5
14	9
15	16
16	15
17	23
18	18
19	13
20	11
21	22
22	19
23	24
24	10
25	34
26	26
27	29
28	36
29	39
30	32
31	27
32	35
33	40
34	31
35	37
36	38
37	28
38	30
39	47
40	42
41	44
42	33
43	43
44	48
45	50
46	49
47	46
48	51
49	54
50	41
51	45
52	52
53	57
54	25
55	56
56	58
57	53
58	65
59	62
60	55
61	59
62	60
63	64
64	61
65	63
66	66
67	67
68	68
69	69
70	70
71	71
72	74
73	73
74	75
75	72
76	76
77	79
78	82
79	77
80	84
81	81
82	80
83	78
84	83
85	88
86	85
87	97
88	86
89	87