A239139 - cp's OEIS frontend

A239139 The sequence S = a(1), a(2), ... is defined by a(1)=1, if d,e,f are consecutive decimal digits then we do not have d <= e = f, and S is always extended with the smallest integer not yet present in S.

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	10
11	12
12	11
13	20
14	13
15	14
16	15
17	16
18	17
19	18
20	19
21	21
22	23
23	22
24	30
25	24
26	25
27	26
28	27
29	28
30	29
31	31
32	32
33	34
34	33
35	40
36	35
37	36
38	37
39	38
40	39
41	41
42	42
43	43
44	45
45	44
46	50
47	46
48	47
49	48
50	49
51	51
52	52
53	53
54	54
55	56
56	55
57	60
58	57
59	58
60	59
61	61
62	62
63	63
64	64
65	65
66	67
67	66

[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 11, 20, 13, 14, 15, 16, 17, 18, 19, 21, 23, 22, 30, 24, 25, 26, 27, 28, 29, 31, 32, 34, 33, 40, 35, 36, 37, 38, 39, 41, 42, 43, 45, 44, 50, 46, 47, 48, 49, 51, 52, 53, 54, 56, 55, 60, 57, 58, 59, 61, 62, 63, 64, 65, 67, 66]

cp's OEIS Frontend

A239139 The sequence S = a(1), a(2), ... is defined by a(1)=1, if d,e,f are consecutive decimal digits then we do not have d <= e = f, and S is always extended with the smallest integer not yet present in S.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	10
11	12
12	11
13	20
14	13
15	14
16	15
17	16
18	17
19	18
20	19
21	21
22	23
23	22
24	30
25	24
26	25
27	26
28	27
29	28
30	29
31	31
32	32
33	34
34	33
35	40
36	35
37	36
38	37
39	38
40	39
41	41
42	42
43	43
44	45
45	44
46	50
47	46
48	47
49	48
50	49
51	51
52	52
53	53
54	54
55	56
56	55
57	60
58	57
59	58
60	59
61	61
62	62
63	63
64	64
65	65
66	67
67	66

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	10
11	12
12	11
13	20
14	13
15	14
16	15
17	16
18	17
19	18
20	19
21	21
22	23
23	22
24	30
25	24
26	25
27	26
28	27
29	28
30	29
31	31
32	32
33	34
34	33
35	40
36	35
37	36
38	37
39	38
40	39
41	41
42	42
43	43
44	45
45	44
46	50
47	46
48	47
49	48
50	49
51	51
52	52
53	53
54	54
55	56
56	55
57	60
58	57
59	58
60	59
61	61
62	62
63	63
64	64
65	65
66	67
67	66

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	10
11	12
12	11
13	20
14	13
15	14
16	15
17	16
18	17
19	18
20	19
21	21
22	23
23	22
24	30
25	24
26	25
27	26
28	27
29	28
30	29
31	31
32	32
33	34
34	33
35	40
36	35
37	36
38	37
39	38
40	39
41	41
42	42
43	43
44	45
45	44
46	50
47	46
48	47
49	48
50	49
51	51
52	52
53	53
54	54
55	56
56	55
57	60
58	57
59	58
60	59
61	61
62	62
63	63
64	64
65	65
66	67
67	66