A342441 - cp's OEIS frontend

A342441 a(1) = 1; 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	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	11
11	13
12	14
13	15
14	17
15	16
16	18
17	12
18	21
19	19
20	25
21	22
22	23
23	26
24	24
25	27
26	28
27	29
28	31
29	33
30	32
31	34
32	35
33	36
34	38
35	39
36	41
37	42
38	43
39	37
40	44
41	45
42	46
43	47
44	48
45	51
46	149
47	53
48	49
49	52
50	54
51	55
52	56
53	57
54	59
55	58
56	63
57	64
58	65
59	66
60	67
61	68
62	62
63	69
64	72
65	73
66	75
67	85
68	77
69	74
70	76
71	78
72	82
73	79

[1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 13, 14, 15, 17, 16, 18, 12, 21, 19, 25, 22, 23, 26, 24, 27, 28, 29, 31, 33, 32, 34, 35, 36, 38, 39, 41, 42, 43, 37, 44, 45, 46, 47, 48, 51, 149, 53, 49, 52, 54, 55, 56, 57, 59, 58, 63, 64, 65, 66, 67, 68, 62, 69, 72, 73, 75, 85, 77, 74, 76, 78, 82, 79]

cp's OEIS Frontend

A342441 a(1) = 1; 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	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	11
11	13
12	14
13	15
14	17
15	16
16	18
17	12
18	21
19	19
20	25
21	22
22	23
23	26
24	24
25	27
26	28
27	29
28	31
29	33
30	32
31	34
32	35
33	36
34	38
35	39
36	41
37	42
38	43
39	37
40	44
41	45
42	46
43	47
44	48
45	51
46	149
47	53
48	49
49	52
50	54
51	55
52	56
53	57
54	59
55	58
56	63
57	64
58	65
59	66
60	67
61	68
62	62
63	69
64	72
65	73
66	75
67	85
68	77
69	74
70	76
71	78
72	82
73	79

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	11
11	13
12	14
13	15
14	17
15	16
16	18
17	12
18	21
19	19
20	25
21	22
22	23
23	26
24	24
25	27
26	28
27	29
28	31
29	33
30	32
31	34
32	35
33	36
34	38
35	39
36	41
37	42
38	43
39	37
40	44
41	45
42	46
43	47
44	48
45	51
46	149
47	53
48	49
49	52
50	54
51	55
52	56
53	57
54	59
55	58
56	63
57	64
58	65
59	66
60	67
61	68
62	62
63	69
64	72
65	73
66	75
67	85
68	77
69	74
70	76
71	78
72	82
73	79

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	11
11	13
12	14
13	15
14	17
15	16
16	18
17	12
18	21
19	19
20	25
21	22
22	23
23	26
24	24
25	27
26	28
27	29
28	31
29	33
30	32
31	34
32	35
33	36
34	38
35	39
36	41
37	42
38	43
39	37
40	44
41	45
42	46
43	47
44	48
45	51
46	149
47	53
48	49
49	52
50	54
51	55
52	56
53	57
54	59
55	58
56	63
57	64
58	65
59	66
60	67
61	68
62	62
63	69
64	72
65	73
66	75
67	85
68	77
69	74
70	76
71	78
72	82
73	79