A366047 - cp's OEIS frontend

A366047 Starting with a(1) = 2, the lexicographically earliest infinite sequence of distinct positive integers such that |a(n) - a(n-1)| is a divisor of a(n)*a(n-1), where |a(n) - a(n-1)| is not a prime and greater than 1.

n	a(n)
1	2
2	6
3	10
4	14
5	18
6	9
7	36
8	12
9	4
10	8
11	16
12	20
13	24
14	15
15	30
16	21
17	42
18	28
19	32
20	40
21	44
22	22
23	26
24	52
25	48
26	39
27	78
28	60
29	35
30	70
31	45
32	54
33	27
34	108
35	72
36	56
37	64
38	68
39	34
40	38
41	76
42	80
43	55
44	110
45	66
46	33
47	132
48	84
49	63
50	90
51	65
52	130
53	104
54	88
55	92
56	46
57	50
58	25
59	150
60	75
61	100
62	96
63	87
64	174
65	58
66	62
67	124
68	116
69	112
70	98
71	49
72	392

[2, 6, 10, 14, 18, 9, 36, 12, 4, 8, 16, 20, 24, 15, 30, 21, 42, 28, 32, 40, 44, 22, 26, 52, 48, 39, 78, 60, 35, 70, 45, 54, 27, 108, 72, 56, 64, 68, 34, 38, 76, 80, 55, 110, 66, 33, 132, 84, 63, 90, 65, 130, 104, 88, 92, 46, 50, 25, 150, 75, 100, 96, 87, 174, 58, 62, 124, 116, 112, 98, 49, 392]

cp's OEIS Frontend

A366047 Starting with a(1) = 2, the lexicographically earliest infinite sequence of distinct positive integers such that |a(n) - a(n-1)| is a divisor of a(n)*a(n-1), where |a(n) - a(n-1)| is not a prime and greater than 1.

Table of values

List of values

n	a(n)
1	2
2	6
3	10
4	14
5	18
6	9
7	36
8	12
9	4
10	8
11	16
12	20
13	24
14	15
15	30
16	21
17	42
18	28
19	32
20	40
21	44
22	22
23	26
24	52
25	48
26	39
27	78
28	60
29	35
30	70
31	45
32	54
33	27
34	108
35	72
36	56
37	64
38	68
39	34
40	38
41	76
42	80
43	55
44	110
45	66
46	33
47	132
48	84
49	63
50	90
51	65
52	130
53	104
54	88
55	92
56	46
57	50
58	25
59	150
60	75
61	100
62	96
63	87
64	174
65	58
66	62
67	124
68	116
69	112
70	98
71	49
72	392

n	a(n)
1	2
2	6
3	10
4	14
5	18
6	9
7	36
8	12
9	4
10	8
11	16
12	20
13	24
14	15
15	30
16	21
17	42
18	28
19	32
20	40
21	44
22	22
23	26
24	52
25	48
26	39
27	78
28	60
29	35
30	70
31	45
32	54
33	27
34	108
35	72
36	56
37	64
38	68
39	34
40	38
41	76
42	80
43	55
44	110
45	66
46	33
47	132
48	84
49	63
50	90
51	65
52	130
53	104
54	88
55	92
56	46
57	50
58	25
59	150
60	75
61	100
62	96
63	87
64	174
65	58
66	62
67	124
68	116
69	112
70	98
71	49
72	392

n	a(n)
1	2
2	6
3	10
4	14
5	18
6	9
7	36
8	12
9	4
10	8
11	16
12	20
13	24
14	15
15	30
16	21
17	42
18	28
19	32
20	40
21	44
22	22
23	26
24	52
25	48
26	39
27	78
28	60
29	35
30	70
31	45
32	54
33	27
34	108
35	72
36	56
37	64
38	68
39	34
40	38
41	76
42	80
43	55
44	110
45	66
46	33
47	132
48	84
49	63
50	90
51	65
52	130
53	104
54	88
55	92
56	46
57	50
58	25
59	150
60	75
61	100
62	96
63	87
64	174
65	58
66	62
67	124
68	116
69	112
70	98
71	49
72	392