A341909 - cp's OEIS frontend

A341909 a(0) = 0; for n > 0, a(n) is the smallest positive integer not yet in the sequence such that the first digit of a(n) differs by 1 from the last digit of a(n-1).

n	a(n)
0	0
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	80
11	10
12	11
13	20
14	12
15	13
16	21
17	22
18	14
19	30
20	15
21	40
22	16
23	50
24	17
25	60
26	18
27	70
28	19
29	81
30	23
31	24
32	31
33	25
34	41
35	26
36	51
37	27
38	61
39	28
40	71
41	29
42	82
43	32
44	33
45	42
46	34
47	35
48	43
49	44
50	36
51	52
52	37
53	62
54	38
55	72
56	39
57	83
58	45
59	46
60	53
61	47
62	63
63	48
64	73
65	49
66	84
67	54
68	55
69	64
70	56
71	57
72	65
73	66
74	58
75	74
76	59

[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 80, 10, 11, 20, 12, 13, 21, 22, 14, 30, 15, 40, 16, 50, 17, 60, 18, 70, 19, 81, 23, 24, 31, 25, 41, 26, 51, 27, 61, 28, 71, 29, 82, 32, 33, 42, 34, 35, 43, 44, 36, 52, 37, 62, 38, 72, 39, 83, 45, 46, 53, 47, 63, 48, 73, 49, 84, 54, 55, 64, 56, 57, 65, 66, 58, 74, 59]

cp's OEIS Frontend

A341909 a(0) = 0; for n > 0, a(n) is the smallest positive integer not yet in the sequence such that the first digit of a(n) differs by 1 from the last digit of a(n-1).

Table of values

List of values

n	a(n)
0	0
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	80
11	10
12	11
13	20
14	12
15	13
16	21
17	22
18	14
19	30
20	15
21	40
22	16
23	50
24	17
25	60
26	18
27	70
28	19
29	81
30	23
31	24
32	31
33	25
34	41
35	26
36	51
37	27
38	61
39	28
40	71
41	29
42	82
43	32
44	33
45	42
46	34
47	35
48	43
49	44
50	36
51	52
52	37
53	62
54	38
55	72
56	39
57	83
58	45
59	46
60	53
61	47
62	63
63	48
64	73
65	49
66	84
67	54
68	55
69	64
70	56
71	57
72	65
73	66
74	58
75	74
76	59

n	a(n)
0	0
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	80
11	10
12	11
13	20
14	12
15	13
16	21
17	22
18	14
19	30
20	15
21	40
22	16
23	50
24	17
25	60
26	18
27	70
28	19
29	81
30	23
31	24
32	31
33	25
34	41
35	26
36	51
37	27
38	61
39	28
40	71
41	29
42	82
43	32
44	33
45	42
46	34
47	35
48	43
49	44
50	36
51	52
52	37
53	62
54	38
55	72
56	39
57	83
58	45
59	46
60	53
61	47
62	63
63	48
64	73
65	49
66	84
67	54
68	55
69	64
70	56
71	57
72	65
73	66
74	58
75	74
76	59

n	a(n)
0	0
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	80
11	10
12	11
13	20
14	12
15	13
16	21
17	22
18	14
19	30
20	15
21	40
22	16
23	50
24	17
25	60
26	18
27	70
28	19
29	81
30	23
31	24
32	31
33	25
34	41
35	26
36	51
37	27
38	61
39	28
40	71
41	29
42	82
43	32
44	33
45	42
46	34
47	35
48	43
49	44
50	36
51	52
52	37
53	62
54	38
55	72
56	39
57	83
58	45
59	46
60	53
61	47
62	63
63	48
64	73
65	49
66	84
67	54
68	55
69	64
70	56
71	57
72	65
73	66
74	58
75	74
76	59