A299987 - cp's OEIS frontend

A299987 Lexicographic first sequence of nonnegative integers such that a(n) + a(n+1) has a digit 7, and no term occurs twice.

n	a(n)
0	0
1	7
2	10
3	17
4	20
5	27
6	30
7	37
8	33
9	4
10	3
11	14
12	13
13	24
14	23
15	34
16	36
17	1
18	6
19	11
20	16
21	21
22	26
23	31
24	39
25	8
26	9
27	18
28	19
29	28
30	29
31	38
32	32
33	5
34	2
35	15
36	12
37	25
38	22
39	35
40	40
41	47
42	50
43	57
44	60
45	67
46	70
47	77
48	80
49	87
50	83
51	44
52	43
53	54
54	53
55	64
56	63
57	74
58	73
59	84
60	86
61	41
62	46
63	51
64	56
65	61
66	66
67	71
68	76
69	81
70	89
71	48
72	49
73	58
74	59
75	68
76	69
77	78
78	79
79	88
80	82
81	45
82	42
83	55
84	52
85	65
86	62
87	75
88	72
89	85
90	90

[0, 7, 10, 17, 20, 27, 30, 37, 33, 4, 3, 14, 13, 24, 23, 34, 36, 1, 6, 11, 16, 21, 26, 31, 39, 8, 9, 18, 19, 28, 29, 38, 32, 5, 2, 15, 12, 25, 22, 35, 40, 47, 50, 57, 60, 67, 70, 77, 80, 87, 83, 44, 43, 54, 53, 64, 63, 74, 73, 84, 86, 41, 46, 51, 56, 61, 66, 71, 76, 81, 89, 48, 49, 58, 59, 68, 69, 78, 79, 88, 82, 45, 42, 55, 52, 65, 62, 75, 72, 85, 90]

cp's OEIS Frontend

A299987 Lexicographic first sequence of nonnegative integers such that a(n) + a(n+1) has a digit 7, and no term occurs twice.

Table of values

List of values

n	a(n)
0	0
1	7
2	10
3	17
4	20
5	27
6	30
7	37
8	33
9	4
10	3
11	14
12	13
13	24
14	23
15	34
16	36
17	1
18	6
19	11
20	16
21	21
22	26
23	31
24	39
25	8
26	9
27	18
28	19
29	28
30	29
31	38
32	32
33	5
34	2
35	15
36	12
37	25
38	22
39	35
40	40
41	47
42	50
43	57
44	60
45	67
46	70
47	77
48	80
49	87
50	83
51	44
52	43
53	54
54	53
55	64
56	63
57	74
58	73
59	84
60	86
61	41
62	46
63	51
64	56
65	61
66	66
67	71
68	76
69	81
70	89
71	48
72	49
73	58
74	59
75	68
76	69
77	78
78	79
79	88
80	82
81	45
82	42
83	55
84	52
85	65
86	62
87	75
88	72
89	85
90	90

n	a(n)
0	0
1	7
2	10
3	17
4	20
5	27
6	30
7	37
8	33
9	4
10	3
11	14
12	13
13	24
14	23
15	34
16	36
17	1
18	6
19	11
20	16
21	21
22	26
23	31
24	39
25	8
26	9
27	18
28	19
29	28
30	29
31	38
32	32
33	5
34	2
35	15
36	12
37	25
38	22
39	35
40	40
41	47
42	50
43	57
44	60
45	67
46	70
47	77
48	80
49	87
50	83
51	44
52	43
53	54
54	53
55	64
56	63
57	74
58	73
59	84
60	86
61	41
62	46
63	51
64	56
65	61
66	66
67	71
68	76
69	81
70	89
71	48
72	49
73	58
74	59
75	68
76	69
77	78
78	79
79	88
80	82
81	45
82	42
83	55
84	52
85	65
86	62
87	75
88	72
89	85
90	90

n	a(n)
0	0
1	7
2	10
3	17
4	20
5	27
6	30
7	37
8	33
9	4
10	3
11	14
12	13
13	24
14	23
15	34
16	36
17	1
18	6
19	11
20	16
21	21
22	26
23	31
24	39
25	8
26	9
27	18
28	19
29	28
30	29
31	38
32	32
33	5
34	2
35	15
36	12
37	25
38	22
39	35
40	40
41	47
42	50
43	57
44	60
45	67
46	70
47	77
48	80
49	87
50	83
51	44
52	43
53	54
54	53
55	64
56	63
57	74
58	73
59	84
60	86
61	41
62	46
63	51
64	56
65	61
66	66
67	71
68	76
69	81
70	89
71	48
72	49
73	58
74	59
75	68
76	69
77	78
78	79
79	88
80	82
81	45
82	42
83	55
84	52
85	65
86	62
87	75
88	72
89	85
90	90