A239217 - cp's OEIS frontend

A239217 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	20
13	12
14	13
15	14
16	15
17	16
18	17
19	18
20	19
21	21
22	22
23	30
24	23
25	24
26	25
27	26
28	27
29	28
30	29
31	31
32	32
33	33
34	40
35	34
36	35
37	36
38	37
39	38
40	39
41	41
42	42
43	43
44	44
45	50
46	45
47	46
48	47
49	48
50	49
51	51
52	52
53	53
54	54
55	55
56	60
57	56
58	57
59	58
60	59
61	61
62	62
63	63
64	64
65	65
66	66
67	70
68	67
69	68
70	69
71	71
72	72
73	73
74	74
75	75
76	76
77	77
78	80
79	78
80	79
81	81
82	82
83	83
84	84
85	85
86	86
87	87
88	88
89	90
90	89
91	91
92	92
93	93
94	94
95	95
96	96
97	97
98	98
99	99
100	101
101	102
102	103
103	104
104	105
105	106
106	107
107	108
108	109

[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 20, 12, 13, 14, 15, 16, 17, 18, 19, 21, 22, 30, 23, 24, 25, 26, 27, 28, 29, 31, 32, 33, 40, 34, 35, 36, 37, 38, 39, 41, 42, 43, 44, 50, 45, 46, 47, 48, 49, 51, 52, 53, 54, 55, 60, 56, 57, 58, 59, 61, 62, 63, 64, 65, 66, 70, 67, 68, 69, 71, 72, 73, 74, 75, 76, 77, 80, 78, 79, 81, 82, 83, 84, 85, 86, 87, 88, 90, 89, 91, 92, 93, 94, 95, 96, 97, 98, 99, 101, 102, 103, 104, 105, 106, 107, 108, 109]

cp's OEIS Frontend

A239217 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	20
13	12
14	13
15	14
16	15
17	16
18	17
19	18
20	19
21	21
22	22
23	30
24	23
25	24
26	25
27	26
28	27
29	28
30	29
31	31
32	32
33	33
34	40
35	34
36	35
37	36
38	37
39	38
40	39
41	41
42	42
43	43
44	44
45	50
46	45
47	46
48	47
49	48
50	49
51	51
52	52
53	53
54	54
55	55
56	60
57	56
58	57
59	58
60	59
61	61
62	62
63	63
64	64
65	65
66	66
67	70
68	67
69	68
70	69
71	71
72	72
73	73
74	74
75	75
76	76
77	77
78	80
79	78
80	79
81	81
82	82
83	83
84	84
85	85
86	86
87	87
88	88
89	90
90	89
91	91
92	92
93	93
94	94
95	95
96	96
97	97
98	98
99	99
100	101
101	102
102	103
103	104
104	105
105	106
106	107
107	108
108	109

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	20
13	12
14	13
15	14
16	15
17	16
18	17
19	18
20	19
21	21
22	22
23	30
24	23
25	24
26	25
27	26
28	27
29	28
30	29
31	31
32	32
33	33
34	40
35	34
36	35
37	36
38	37
39	38
40	39
41	41
42	42
43	43
44	44
45	50
46	45
47	46
48	47
49	48
50	49
51	51
52	52
53	53
54	54
55	55
56	60
57	56
58	57
59	58
60	59
61	61
62	62
63	63
64	64
65	65
66	66
67	70
68	67
69	68
70	69
71	71
72	72
73	73
74	74
75	75
76	76
77	77
78	80
79	78
80	79
81	81
82	82
83	83
84	84
85	85
86	86
87	87
88	88
89	90
90	89
91	91
92	92
93	93
94	94
95	95
96	96
97	97
98	98
99	99
100	101
101	102
102	103
103	104
104	105
105	106
106	107
107	108
108	109

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	20
13	12
14	13
15	14
16	15
17	16
18	17
19	18
20	19
21	21
22	22
23	30
24	23
25	24
26	25
27	26
28	27
29	28
30	29
31	31
32	32
33	33
34	40
35	34
36	35
37	36
38	37
39	38
40	39
41	41
42	42
43	43
44	44
45	50
46	45
47	46
48	47
49	48
50	49
51	51
52	52
53	53
54	54
55	55
56	60
57	56
58	57
59	58
60	59
61	61
62	62
63	63
64	64
65	65
66	66
67	70
68	67
69	68
70	69
71	71
72	72
73	73
74	74
75	75
76	76
77	77
78	80
79	78
80	79
81	81
82	82
83	83
84	84
85	85
86	86
87	87
88	88
89	90
90	89
91	91
92	92
93	93
94	94
95	95
96	96
97	97
98	98
99	99
100	101
101	102
102	103
103	104
104	105
105	106
106	107
107	108
108	109