A349944 - cp's OEIS frontend

A349944 a (1) = 1; a(n) is the smallest number not yet present in the sequence such that the concatenation of a(n-1) and a(n) contains three consecutive descending digits d > e > f.

n	a(n)
1	1
2	210
3	2
4	10
5	310
6	3
7	20
8	320
9	4
10	21
11	321
12	5
13	30
14	410
15	6
16	31
17	420
18	7
19	32
20	11
21	421
22	8
23	40
24	430
25	9
26	41
27	431
28	12
29	100
30	432
31	13
32	101
33	510
34	14
35	102
36	103
37	104
38	105
39	42
40	15
41	43
42	16
43	50
44	520
45	17
46	51
47	521
48	18
49	52
50	19
51	53
52	22
53	106
54	54
55	23
56	107
57	60
58	530
59	24
60	108
61	61

[1, 210, 2, 10, 310, 3, 20, 320, 4, 21, 321, 5, 30, 410, 6, 31, 420, 7, 32, 11, 421, 8, 40, 430, 9, 41, 431, 12, 100, 432, 13, 101, 510, 14, 102, 103, 104, 105, 42, 15, 43, 16, 50, 520, 17, 51, 521, 18, 52, 19, 53, 22, 106, 54, 23, 107, 60, 530, 24, 108, 61]

cp's OEIS Frontend

A349944 a (1) = 1; a(n) is the smallest number not yet present in the sequence such that the concatenation of a(n-1) and a(n) contains three consecutive descending digits d > e > f.

Table of values

List of values

n	a(n)
1	1
2	210
3	2
4	10
5	310
6	3
7	20
8	320
9	4
10	21
11	321
12	5
13	30
14	410
15	6
16	31
17	420
18	7
19	32
20	11
21	421
22	8
23	40
24	430
25	9
26	41
27	431
28	12
29	100
30	432
31	13
32	101
33	510
34	14
35	102
36	103
37	104
38	105
39	42
40	15
41	43
42	16
43	50
44	520
45	17
46	51
47	521
48	18
49	52
50	19
51	53
52	22
53	106
54	54
55	23
56	107
57	60
58	530
59	24
60	108
61	61

n	a(n)
1	1
2	210
3	2
4	10
5	310
6	3
7	20
8	320
9	4
10	21
11	321
12	5
13	30
14	410
15	6
16	31
17	420
18	7
19	32
20	11
21	421
22	8
23	40
24	430
25	9
26	41
27	431
28	12
29	100
30	432
31	13
32	101
33	510
34	14
35	102
36	103
37	104
38	105
39	42
40	15
41	43
42	16
43	50
44	520
45	17
46	51
47	521
48	18
49	52
50	19
51	53
52	22
53	106
54	54
55	23
56	107
57	60
58	530
59	24
60	108
61	61

n	a(n)
1	1
2	210
3	2
4	10
5	310
6	3
7	20
8	320
9	4
10	21
11	321
12	5
13	30
14	410
15	6
16	31
17	420
18	7
19	32
20	11
21	421
22	8
23	40
24	430
25	9
26	41
27	431
28	12
29	100
30	432
31	13
32	101
33	510
34	14
35	102
36	103
37	104
38	105
39	42
40	15
41	43
42	16
43	50
44	520
45	17
46	51
47	521
48	18
49	52
50	19
51	53
52	22
53	106
54	54
55	23
56	107
57	60
58	530
59	24
60	108
61	61