A239137 - cp's OEIS frontend

A239137 The sequence S = a(1), a(2), ... is defined by a(1)=1, if d,e,f are consecutive 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	10
4	3
5	12
6	13
7	14
8	15
9	4
10	5
11	16
12	17
13	6
14	7
15	18
16	19
17	8
18	9
19	20
20	21
21	30
22	31
23	32
24	40
25	41
26	42
27	43
28	22
29	102
30	103
31	23
32	24
33	25
34	26
35	27
36	28
37	29
38	33
39	104
40	34
41	35
42	36
43	37
44	38
45	39
46	44
47	105
48	45
49	46
50	47
51	48
52	49
53	50
54	51
55	52
56	53
57	54
58	60
59	61
60	62
61	63
62	64
63	65
64	70
65	71
66	72
67	73

[1, 2, 10, 3, 12, 13, 14, 15, 4, 5, 16, 17, 6, 7, 18, 19, 8, 9, 20, 21, 30, 31, 32, 40, 41, 42, 43, 22, 102, 103, 23, 24, 25, 26, 27, 28, 29, 33, 104, 34, 35, 36, 37, 38, 39, 44, 105, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 60, 61, 62, 63, 64, 65, 70, 71, 72, 73]

cp's OEIS Frontend

A239137 The sequence S = a(1), a(2), ... is defined by a(1)=1, if d,e,f are consecutive 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	10
4	3
5	12
6	13
7	14
8	15
9	4
10	5
11	16
12	17
13	6
14	7
15	18
16	19
17	8
18	9
19	20
20	21
21	30
22	31
23	32
24	40
25	41
26	42
27	43
28	22
29	102
30	103
31	23
32	24
33	25
34	26
35	27
36	28
37	29
38	33
39	104
40	34
41	35
42	36
43	37
44	38
45	39
46	44
47	105
48	45
49	46
50	47
51	48
52	49
53	50
54	51
55	52
56	53
57	54
58	60
59	61
60	62
61	63
62	64
63	65
64	70
65	71
66	72
67	73

n	a(n)
1	1
2	2
3	10
4	3
5	12
6	13
7	14
8	15
9	4
10	5
11	16
12	17
13	6
14	7
15	18
16	19
17	8
18	9
19	20
20	21
21	30
22	31
23	32
24	40
25	41
26	42
27	43
28	22
29	102
30	103
31	23
32	24
33	25
34	26
35	27
36	28
37	29
38	33
39	104
40	34
41	35
42	36
43	37
44	38
45	39
46	44
47	105
48	45
49	46
50	47
51	48
52	49
53	50
54	51
55	52
56	53
57	54
58	60
59	61
60	62
61	63
62	64
63	65
64	70
65	71
66	72
67	73

n	a(n)
1	1
2	2
3	10
4	3
5	12
6	13
7	14
8	15
9	4
10	5
11	16
12	17
13	6
14	7
15	18
16	19
17	8
18	9
19	20
20	21
21	30
22	31
23	32
24	40
25	41
26	42
27	43
28	22
29	102
30	103
31	23
32	24
33	25
34	26
35	27
36	28
37	29
38	33
39	104
40	34
41	35
42	36
43	37
44	38
45	39
46	44
47	105
48	45
49	46
50	47
51	48
52	49
53	50
54	51
55	52
56	53
57	54
58	60
59	61
60	62
61	63
62	64
63	65
64	70
65	71
66	72
67	73