A342442 - cp's OEIS frontend

A342442 a(1) = 2; for n > 1, a(n) is the least positive integer not occurring earlier such that a(n-1)*a(n) shares no digit with either a(n-1) or a(n).

n	a(n)
1	2
2	3
3	4
4	5
5	6
6	7
7	8
8	9
9	42
10	14
11	17
12	18
13	15
14	16
15	13
16	19
17	32
18	22
19	23
20	26
21	29
22	12
23	25
24	24
25	34
26	27
27	33
28	36
29	39
30	43
31	37
32	38
33	28
34	47
35	44
36	45
37	46
38	63
39	66
40	65
41	48
42	49
43	62
44	55
45	54
46	35
47	174
48	53
49	76
50	57
51	56
52	59
53	52
54	58
55	64
56	92
57	74
58	68
59	78
60	72
61	77
62	67
63	73
64	83
65	69
66	79
67	84
68	75
69	88
70	113
71	183
72	138
73	149
74	148

[2, 3, 4, 5, 6, 7, 8, 9, 42, 14, 17, 18, 15, 16, 13, 19, 32, 22, 23, 26, 29, 12, 25, 24, 34, 27, 33, 36, 39, 43, 37, 38, 28, 47, 44, 45, 46, 63, 66, 65, 48, 49, 62, 55, 54, 35, 174, 53, 76, 57, 56, 59, 52, 58, 64, 92, 74, 68, 78, 72, 77, 67, 73, 83, 69, 79, 84, 75, 88, 113, 183, 138, 149, 148]

cp's OEIS Frontend

A342442 a(1) = 2; for n > 1, a(n) is the least positive integer not occurring earlier such that a(n-1)*a(n) shares no digit with either a(n-1) or a(n).

Table of values

List of values

n	a(n)
1	2
2	3
3	4
4	5
5	6
6	7
7	8
8	9
9	42
10	14
11	17
12	18
13	15
14	16
15	13
16	19
17	32
18	22
19	23
20	26
21	29
22	12
23	25
24	24
25	34
26	27
27	33
28	36
29	39
30	43
31	37
32	38
33	28
34	47
35	44
36	45
37	46
38	63
39	66
40	65
41	48
42	49
43	62
44	55
45	54
46	35
47	174
48	53
49	76
50	57
51	56
52	59
53	52
54	58
55	64
56	92
57	74
58	68
59	78
60	72
61	77
62	67
63	73
64	83
65	69
66	79
67	84
68	75
69	88
70	113
71	183
72	138
73	149
74	148

n	a(n)
1	2
2	3
3	4
4	5
5	6
6	7
7	8
8	9
9	42
10	14
11	17
12	18
13	15
14	16
15	13
16	19
17	32
18	22
19	23
20	26
21	29
22	12
23	25
24	24
25	34
26	27
27	33
28	36
29	39
30	43
31	37
32	38
33	28
34	47
35	44
36	45
37	46
38	63
39	66
40	65
41	48
42	49
43	62
44	55
45	54
46	35
47	174
48	53
49	76
50	57
51	56
52	59
53	52
54	58
55	64
56	92
57	74
58	68
59	78
60	72
61	77
62	67
63	73
64	83
65	69
66	79
67	84
68	75
69	88
70	113
71	183
72	138
73	149
74	148

n	a(n)
1	2
2	3
3	4
4	5
5	6
6	7
7	8
8	9
9	42
10	14
11	17
12	18
13	15
14	16
15	13
16	19
17	32
18	22
19	23
20	26
21	29
22	12
23	25
24	24
25	34
26	27
27	33
28	36
29	39
30	43
31	37
32	38
33	28
34	47
35	44
36	45
37	46
38	63
39	66
40	65
41	48
42	49
43	62
44	55
45	54
46	35
47	174
48	53
49	76
50	57
51	56
52	59
53	52
54	58
55	64
56	92
57	74
58	68
59	78
60	72
61	77
62	67
63	73
64	83
65	69
66	79
67	84
68	75
69	88
70	113
71	183
72	138
73	149
74	148