A350927 - cp's OEIS frontend

A350927 a(1)=1, a(2)=2; for n > 2, a(n) is the smallest unused positive number such that gcd(a(n-1) * |a(n-1) - a(n-2)|, a(n)) > 1.

n	a(n)
1	1
2	2
3	4
4	6
5	3
6	9
7	8
8	10
9	5
10	15
11	12
12	14
13	7
14	21
15	16
16	18
17	20
18	22
19	11
20	33
21	24
22	26
23	13
24	39
25	27
26	28
27	30
28	25
29	35
30	32
31	34
32	17
33	51
34	36
35	38
36	19
37	57
38	40
39	42
40	44
41	46
42	23
43	69
44	45
45	48
46	50
47	52
48	54
49	56
50	49
51	63
52	58
53	29
54	87
55	60
56	55
57	65
58	62
59	31
60	93
61	64
62	66
63	68
64	70
65	72
66	74
67	37
68	111
69	75
70	76
71	78
72	80
73	82
74	41
75	123
76	81

[1, 2, 4, 6, 3, 9, 8, 10, 5, 15, 12, 14, 7, 21, 16, 18, 20, 22, 11, 33, 24, 26, 13, 39, 27, 28, 30, 25, 35, 32, 34, 17, 51, 36, 38, 19, 57, 40, 42, 44, 46, 23, 69, 45, 48, 50, 52, 54, 56, 49, 63, 58, 29, 87, 60, 55, 65, 62, 31, 93, 64, 66, 68, 70, 72, 74, 37, 111, 75, 76, 78, 80, 82, 41, 123, 81]

cp's OEIS Frontend

A350927 a(1)=1, a(2)=2; for n > 2, a(n) is the smallest unused positive number such that gcd(a(n-1) * |a(n-1) - a(n-2)|, a(n)) > 1.

Table of values

List of values

n	a(n)
1	1
2	2
3	4
4	6
5	3
6	9
7	8
8	10
9	5
10	15
11	12
12	14
13	7
14	21
15	16
16	18
17	20
18	22
19	11
20	33
21	24
22	26
23	13
24	39
25	27
26	28
27	30
28	25
29	35
30	32
31	34
32	17
33	51
34	36
35	38
36	19
37	57
38	40
39	42
40	44
41	46
42	23
43	69
44	45
45	48
46	50
47	52
48	54
49	56
50	49
51	63
52	58
53	29
54	87
55	60
56	55
57	65
58	62
59	31
60	93
61	64
62	66
63	68
64	70
65	72
66	74
67	37
68	111
69	75
70	76
71	78
72	80
73	82
74	41
75	123
76	81

n	a(n)
1	1
2	2
3	4
4	6
5	3
6	9
7	8
8	10
9	5
10	15
11	12
12	14
13	7
14	21
15	16
16	18
17	20
18	22
19	11
20	33
21	24
22	26
23	13
24	39
25	27
26	28
27	30
28	25
29	35
30	32
31	34
32	17
33	51
34	36
35	38
36	19
37	57
38	40
39	42
40	44
41	46
42	23
43	69
44	45
45	48
46	50
47	52
48	54
49	56
50	49
51	63
52	58
53	29
54	87
55	60
56	55
57	65
58	62
59	31
60	93
61	64
62	66
63	68
64	70
65	72
66	74
67	37
68	111
69	75
70	76
71	78
72	80
73	82
74	41
75	123
76	81

n	a(n)
1	1
2	2
3	4
4	6
5	3
6	9
7	8
8	10
9	5
10	15
11	12
12	14
13	7
14	21
15	16
16	18
17	20
18	22
19	11
20	33
21	24
22	26
23	13
24	39
25	27
26	28
27	30
28	25
29	35
30	32
31	34
32	17
33	51
34	36
35	38
36	19
37	57
38	40
39	42
40	44
41	46
42	23
43	69
44	45
45	48
46	50
47	52
48	54
49	56
50	49
51	63
52	58
53	29
54	87
55	60
56	55
57	65
58	62
59	31
60	93
61	64
62	66
63	68
64	70
65	72
66	74
67	37
68	111
69	75
70	76
71	78
72	80
73	82
74	41
75	123
76	81