A250745 - cp's OEIS frontend

A250745 Start with a(1) = 1; then a(n) = smallest number, not already in the sequence, such that a(n) divides concat(a(1), a(2), ..., a(n)).

n	a(n)
1	1
2	2
3	3
4	5
5	10
6	4
7	8
8	6
9	11
10	20
11	13
12	7
13	9
14	12
15	15
16	18
17	14
18	25
19	30
20	24
21	16
22	32
23	40
24	29
25	50
26	100
27	26
28	52
29	39
30	21
31	28
32	35
33	42
34	17
35	34
36	51
37	23
38	46
39	27
40	36
41	45
42	43
43	19
44	38
45	68
46	48
47	60
48	75
49	90
50	54
51	56
52	58
53	22
54	44
55	33
56	55
57	97
58	125
59	200
60	64
61	80
62	69
63	66
64	88
65	70
66	41
67	82

[1, 2, 3, 5, 10, 4, 8, 6, 11, 20, 13, 7, 9, 12, 15, 18, 14, 25, 30, 24, 16, 32, 40, 29, 50, 100, 26, 52, 39, 21, 28, 35, 42, 17, 34, 51, 23, 46, 27, 36, 45, 43, 19, 38, 68, 48, 60, 75, 90, 54, 56, 58, 22, 44, 33, 55, 97, 125, 200, 64, 80, 69, 66, 88, 70, 41, 82]

cp's OEIS Frontend

A250745 Start with a(1) = 1; then a(n) = smallest number, not already in the sequence, such that a(n) divides concat(a(1), a(2), ..., a(n)).

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	5
5	10
6	4
7	8
8	6
9	11
10	20
11	13
12	7
13	9
14	12
15	15
16	18
17	14
18	25
19	30
20	24
21	16
22	32
23	40
24	29
25	50
26	100
27	26
28	52
29	39
30	21
31	28
32	35
33	42
34	17
35	34
36	51
37	23
38	46
39	27
40	36
41	45
42	43
43	19
44	38
45	68
46	48
47	60
48	75
49	90
50	54
51	56
52	58
53	22
54	44
55	33
56	55
57	97
58	125
59	200
60	64
61	80
62	69
63	66
64	88
65	70
66	41
67	82

n	a(n)
1	1
2	2
3	3
4	5
5	10
6	4
7	8
8	6
9	11
10	20
11	13
12	7
13	9
14	12
15	15
16	18
17	14
18	25
19	30
20	24
21	16
22	32
23	40
24	29
25	50
26	100
27	26
28	52
29	39
30	21
31	28
32	35
33	42
34	17
35	34
36	51
37	23
38	46
39	27
40	36
41	45
42	43
43	19
44	38
45	68
46	48
47	60
48	75
49	90
50	54
51	56
52	58
53	22
54	44
55	33
56	55
57	97
58	125
59	200
60	64
61	80
62	69
63	66
64	88
65	70
66	41
67	82

n	a(n)
1	1
2	2
3	3
4	5
5	10
6	4
7	8
8	6
9	11
10	20
11	13
12	7
13	9
14	12
15	15
16	18
17	14
18	25
19	30
20	24
21	16
22	32
23	40
24	29
25	50
26	100
27	26
28	52
29	39
30	21
31	28
32	35
33	42
34	17
35	34
36	51
37	23
38	46
39	27
40	36
41	45
42	43
43	19
44	38
45	68
46	48
47	60
48	75
49	90
50	54
51	56
52	58
53	22
54	44
55	33
56	55
57	97
58	125
59	200
60	64
61	80
62	69
63	66
64	88
65	70
66	41
67	82