A239218 - cp's OEIS frontend

A239218 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	3
4	4
5	5
6	6
7	7
8	8
9	9
10	10
11	11
12	101
13	20
14	12
15	13
16	14
17	15
18	16
19	17
20	18
21	19
22	21
23	22
24	102
25	30
26	23
27	24
28	25
29	26
30	27
31	28
32	29
33	31
34	32
35	33
36	103
37	40
38	34
39	35
40	36
41	37
42	38
43	39
44	41
45	42
46	43
47	44
48	104
49	50
50	45
51	46
52	47
53	48
54	49
55	51
56	52
57	53
58	54
59	55
60	105
61	60
62	56
63	57
64	58
65	59
66	61

[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 101, 20, 12, 13, 14, 15, 16, 17, 18, 19, 21, 22, 102, 30, 23, 24, 25, 26, 27, 28, 29, 31, 32, 33, 103, 40, 34, 35, 36, 37, 38, 39, 41, 42, 43, 44, 104, 50, 45, 46, 47, 48, 49, 51, 52, 53, 54, 55, 105, 60, 56, 57, 58, 59, 61]

cp's OEIS Frontend

A239218 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	3
4	4
5	5
6	6
7	7
8	8
9	9
10	10
11	11
12	101
13	20
14	12
15	13
16	14
17	15
18	16
19	17
20	18
21	19
22	21
23	22
24	102
25	30
26	23
27	24
28	25
29	26
30	27
31	28
32	29
33	31
34	32
35	33
36	103
37	40
38	34
39	35
40	36
41	37
42	38
43	39
44	41
45	42
46	43
47	44
48	104
49	50
50	45
51	46
52	47
53	48
54	49
55	51
56	52
57	53
58	54
59	55
60	105
61	60
62	56
63	57
64	58
65	59
66	61

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	10
11	11
12	101
13	20
14	12
15	13
16	14
17	15
18	16
19	17
20	18
21	19
22	21
23	22
24	102
25	30
26	23
27	24
28	25
29	26
30	27
31	28
32	29
33	31
34	32
35	33
36	103
37	40
38	34
39	35
40	36
41	37
42	38
43	39
44	41
45	42
46	43
47	44
48	104
49	50
50	45
51	46
52	47
53	48
54	49
55	51
56	52
57	53
58	54
59	55
60	105
61	60
62	56
63	57
64	58
65	59
66	61

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	10
11	11
12	101
13	20
14	12
15	13
16	14
17	15
18	16
19	17
20	18
21	19
22	21
23	22
24	102
25	30
26	23
27	24
28	25
29	26
30	27
31	28
32	29
33	31
34	32
35	33
36	103
37	40
38	34
39	35
40	36
41	37
42	38
43	39
44	41
45	42
46	43
47	44
48	104
49	50
50	45
51	46
52	47
53	48
54	49
55	51
56	52
57	53
58	54
59	55
60	105
61	60
62	56
63	57
64	58
65	59
66	61