A298975 - cp's OEIS frontend

A298975 Lexicographic first sequence of positive integers such that a(n)*a(n+1) has a digit 5, and no term occurs twice.

n	a(n)
1	1
2	5
3	3
4	15
5	7
6	8
7	19
8	24
9	21
10	12
11	13
12	4
13	14
14	11
15	23
16	22
17	16
18	32
19	17
20	9
21	6
22	25
23	2
24	26
25	20
26	27
27	28
28	18
29	29
30	33
31	35
32	10
33	45
34	30
35	50
36	31
37	34
38	37
39	41
40	38
41	40
42	39
43	55
44	43
45	36
46	42
47	49
48	44
49	57
50	62
51	46
52	56
53	51
54	52
55	53
56	48
57	47
58	54
59	64
60	68
61	67
62	59
63	60
64	75
65	58
66	61
67	65
68	63
69	66
70	69
71	73
72	70
73	72
74	71
75	74
76	76
77	77
78	85
79	79
80	83
81	91
82	94
83	80
84	82
85	86
86	88
87	87
88	95
89	81

[1, 5, 3, 15, 7, 8, 19, 24, 21, 12, 13, 4, 14, 11, 23, 22, 16, 32, 17, 9, 6, 25, 2, 26, 20, 27, 28, 18, 29, 33, 35, 10, 45, 30, 50, 31, 34, 37, 41, 38, 40, 39, 55, 43, 36, 42, 49, 44, 57, 62, 46, 56, 51, 52, 53, 48, 47, 54, 64, 68, 67, 59, 60, 75, 58, 61, 65, 63, 66, 69, 73, 70, 72, 71, 74, 76, 77, 85, 79, 83, 91, 94, 80, 82, 86, 88, 87, 95, 81]

cp's OEIS Frontend

A298975 Lexicographic first sequence of positive integers such that a(n)*a(n+1) has a digit 5, and no term occurs twice.

Table of values

List of values

n	a(n)
1	1
2	5
3	3
4	15
5	7
6	8
7	19
8	24
9	21
10	12
11	13
12	4
13	14
14	11
15	23
16	22
17	16
18	32
19	17
20	9
21	6
22	25
23	2
24	26
25	20
26	27
27	28
28	18
29	29
30	33
31	35
32	10
33	45
34	30
35	50
36	31
37	34
38	37
39	41
40	38
41	40
42	39
43	55
44	43
45	36
46	42
47	49
48	44
49	57
50	62
51	46
52	56
53	51
54	52
55	53
56	48
57	47
58	54
59	64
60	68
61	67
62	59
63	60
64	75
65	58
66	61
67	65
68	63
69	66
70	69
71	73
72	70
73	72
74	71
75	74
76	76
77	77
78	85
79	79
80	83
81	91
82	94
83	80
84	82
85	86
86	88
87	87
88	95
89	81

n	a(n)
1	1
2	5
3	3
4	15
5	7
6	8
7	19
8	24
9	21
10	12
11	13
12	4
13	14
14	11
15	23
16	22
17	16
18	32
19	17
20	9
21	6
22	25
23	2
24	26
25	20
26	27
27	28
28	18
29	29
30	33
31	35
32	10
33	45
34	30
35	50
36	31
37	34
38	37
39	41
40	38
41	40
42	39
43	55
44	43
45	36
46	42
47	49
48	44
49	57
50	62
51	46
52	56
53	51
54	52
55	53
56	48
57	47
58	54
59	64
60	68
61	67
62	59
63	60
64	75
65	58
66	61
67	65
68	63
69	66
70	69
71	73
72	70
73	72
74	71
75	74
76	76
77	77
78	85
79	79
80	83
81	91
82	94
83	80
84	82
85	86
86	88
87	87
88	95
89	81

n	a(n)
1	1
2	5
3	3
4	15
5	7
6	8
7	19
8	24
9	21
10	12
11	13
12	4
13	14
14	11
15	23
16	22
17	16
18	32
19	17
20	9
21	6
22	25
23	2
24	26
25	20
26	27
27	28
28	18
29	29
30	33
31	35
32	10
33	45
34	30
35	50
36	31
37	34
38	37
39	41
40	38
41	40
42	39
43	55
44	43
45	36
46	42
47	49
48	44
49	57
50	62
51	46
52	56
53	51
54	52
55	53
56	48
57	47
58	54
59	64
60	68
61	67
62	59
63	60
64	75
65	58
66	61
67	65
68	63
69	66
70	69
71	73
72	70
73	72
74	71
75	74
76	76
77	77
78	85
79	79
80	83
81	91
82	94
83	80
84	82
85	86
86	88
87	87
88	95
89	81