A349472 - cp's OEIS frontend

A349472 a(1)=1; for n > 1, a(n) is the smallest unused positive number such that gcd(a(n-1)+n,a(n)) > 1.

n	a(n)
1	1
2	3
3	2
4	4
5	6
6	8
7	5
8	13
9	10
10	12
11	23
12	7
13	14
14	16
15	31
16	47
17	18
18	9
19	20
20	15
21	21
22	43
23	11
24	25
25	22
26	24
27	17
28	27
29	26
30	28
31	59
32	35
33	30
34	32
35	67
36	103
37	34
38	33
39	36
40	19
41	38
42	40
43	83
44	127
45	42
46	44
47	39
48	29
49	45
50	50
51	101
52	48
53	202
54	46
55	303
56	359
57	52
58	54
59	113
60	173
61	51
62	226
63	68
64	55
65	56
66	58
67	60
68	62
69	131
70	57
71	64
72	66

[1, 3, 2, 4, 6, 8, 5, 13, 10, 12, 23, 7, 14, 16, 31, 47, 18, 9, 20, 15, 21, 43, 11, 25, 22, 24, 17, 27, 26, 28, 59, 35, 30, 32, 67, 103, 34, 33, 36, 19, 38, 40, 83, 127, 42, 44, 39, 29, 45, 50, 101, 48, 202, 46, 303, 359, 52, 54, 113, 173, 51, 226, 68, 55, 56, 58, 60, 62, 131, 57, 64, 66]

cp's OEIS Frontend

A349472 a(1)=1; for n > 1, a(n) is the smallest unused positive number such that gcd(a(n-1)+n,a(n)) > 1.

Table of values

List of values

n	a(n)
1	1
2	3
3	2
4	4
5	6
6	8
7	5
8	13
9	10
10	12
11	23
12	7
13	14
14	16
15	31
16	47
17	18
18	9
19	20
20	15
21	21
22	43
23	11
24	25
25	22
26	24
27	17
28	27
29	26
30	28
31	59
32	35
33	30
34	32
35	67
36	103
37	34
38	33
39	36
40	19
41	38
42	40
43	83
44	127
45	42
46	44
47	39
48	29
49	45
50	50
51	101
52	48
53	202
54	46
55	303
56	359
57	52
58	54
59	113
60	173
61	51
62	226
63	68
64	55
65	56
66	58
67	60
68	62
69	131
70	57
71	64
72	66

n	a(n)
1	1
2	3
3	2
4	4
5	6
6	8
7	5
8	13
9	10
10	12
11	23
12	7
13	14
14	16
15	31
16	47
17	18
18	9
19	20
20	15
21	21
22	43
23	11
24	25
25	22
26	24
27	17
28	27
29	26
30	28
31	59
32	35
33	30
34	32
35	67
36	103
37	34
38	33
39	36
40	19
41	38
42	40
43	83
44	127
45	42
46	44
47	39
48	29
49	45
50	50
51	101
52	48
53	202
54	46
55	303
56	359
57	52
58	54
59	113
60	173
61	51
62	226
63	68
64	55
65	56
66	58
67	60
68	62
69	131
70	57
71	64
72	66

n	a(n)
1	1
2	3
3	2
4	4
5	6
6	8
7	5
8	13
9	10
10	12
11	23
12	7
13	14
14	16
15	31
16	47
17	18
18	9
19	20
20	15
21	21
22	43
23	11
24	25
25	22
26	24
27	17
28	27
29	26
30	28
31	59
32	35
33	30
34	32
35	67
36	103
37	34
38	33
39	36
40	19
41	38
42	40
43	83
44	127
45	42
46	44
47	39
48	29
49	45
50	50
51	101
52	48
53	202
54	46
55	303
56	359
57	52
58	54
59	113
60	173
61	51
62	226
63	68
64	55
65	56
66	58
67	60
68	62
69	131
70	57
71	64
72	66