A351629 - cp's OEIS frontend

A351629 a(1) = 1, a(2) = 2 and a(n) is the smallest integer not included earlier whose first digit divides the concatenation a(n-2), a(n-1).

n	a(n)
1	1
2	2
3	3
4	10
5	5
6	7
7	11
8	9
9	12
10	4
11	13
12	14
13	6
14	15
15	16
16	17
17	18
18	19
19	100
20	20
21	21
22	101
23	102
24	22
25	23
26	30
27	24
28	8
29	25
30	31
31	103
32	104
33	26
34	27
35	105
36	32
37	28
38	29
39	33
40	70
41	50
42	34
43	35
44	36
45	40
46	41
47	37
48	38
49	39
50	106
51	107
52	108
53	42
54	60
55	43
56	109
57	110
58	51
59	111
60	90
61	52
62	44
63	45
64	53
65	112
66	46
67	113
68	114
69	115
70	54
71	116
72	47

[1, 2, 3, 10, 5, 7, 11, 9, 12, 4, 13, 14, 6, 15, 16, 17, 18, 19, 100, 20, 21, 101, 102, 22, 23, 30, 24, 8, 25, 31, 103, 104, 26, 27, 105, 32, 28, 29, 33, 70, 50, 34, 35, 36, 40, 41, 37, 38, 39, 106, 107, 108, 42, 60, 43, 109, 110, 51, 111, 90, 52, 44, 45, 53, 112, 46, 113, 114, 115, 54, 116, 47]

cp's OEIS Frontend

A351629 a(1) = 1, a(2) = 2 and a(n) is the smallest integer not included earlier whose first digit divides the concatenation a(n-2), a(n-1).

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	10
5	5
6	7
7	11
8	9
9	12
10	4
11	13
12	14
13	6
14	15
15	16
16	17
17	18
18	19
19	100
20	20
21	21
22	101
23	102
24	22
25	23
26	30
27	24
28	8
29	25
30	31
31	103
32	104
33	26
34	27
35	105
36	32
37	28
38	29
39	33
40	70
41	50
42	34
43	35
44	36
45	40
46	41
47	37
48	38
49	39
50	106
51	107
52	108
53	42
54	60
55	43
56	109
57	110
58	51
59	111
60	90
61	52
62	44
63	45
64	53
65	112
66	46
67	113
68	114
69	115
70	54
71	116
72	47

n	a(n)
1	1
2	2
3	3
4	10
5	5
6	7
7	11
8	9
9	12
10	4
11	13
12	14
13	6
14	15
15	16
16	17
17	18
18	19
19	100
20	20
21	21
22	101
23	102
24	22
25	23
26	30
27	24
28	8
29	25
30	31
31	103
32	104
33	26
34	27
35	105
36	32
37	28
38	29
39	33
40	70
41	50
42	34
43	35
44	36
45	40
46	41
47	37
48	38
49	39
50	106
51	107
52	108
53	42
54	60
55	43
56	109
57	110
58	51
59	111
60	90
61	52
62	44
63	45
64	53
65	112
66	46
67	113
68	114
69	115
70	54
71	116
72	47

n	a(n)
1	1
2	2
3	3
4	10
5	5
6	7
7	11
8	9
9	12
10	4
11	13
12	14
13	6
14	15
15	16
16	17
17	18
18	19
19	100
20	20
21	21
22	101
23	102
24	22
25	23
26	30
27	24
28	8
29	25
30	31
31	103
32	104
33	26
34	27
35	105
36	32
37	28
38	29
39	33
40	70
41	50
42	34
43	35
44	36
45	40
46	41
47	37
48	38
49	39
50	106
51	107
52	108
53	42
54	60
55	43
56	109
57	110
58	51
59	111
60	90
61	52
62	44
63	45
64	53
65	112
66	46
67	113
68	114
69	115
70	54
71	116
72	47