A367741 - cp's OEIS frontend

A367741 Lexicographically earliest infinite sequence of distinct positive numbers such that, for n>3, a(n) has a common factor with a(n-2) but not with a(n-1) or n.

n	a(n)
1	1
2	3
3	2
4	15
5	4
6	5
7	6
8	35
9	8
10	7
11	10
12	77
13	12
14	11
15	14
16	33
17	16
18	55
19	18
20	143
21	20
22	13
23	22
24	65
25	24
26	25
27	26
28	85
29	28
30	17
31	21
32	187
33	56
34	99
35	32
36	121
37	30
38	253
39	34
40	23
41	36
42	115
43	38
44	45
45	19
46	39
47	76
48	91
49	40
50	49
51	44
52	63
53	46
54	119
55	48
56	221
57	50
58	51
59	52
60	289
61	42
62	323
63	58
64	57
65	29
66	95
67	87
68	133
69	116
70	171
71	62
72	209
73	31

[1, 3, 2, 15, 4, 5, 6, 35, 8, 7, 10, 77, 12, 11, 14, 33, 16, 55, 18, 143, 20, 13, 22, 65, 24, 25, 26, 85, 28, 17, 21, 187, 56, 99, 32, 121, 30, 253, 34, 23, 36, 115, 38, 45, 19, 39, 76, 91, 40, 49, 44, 63, 46, 119, 48, 221, 50, 51, 52, 289, 42, 323, 58, 57, 29, 95, 87, 133, 116, 171, 62, 209, 31]

cp's OEIS Frontend

A367741 Lexicographically earliest infinite sequence of distinct positive numbers such that, for n>3, a(n) has a common factor with a(n-2) but not with a(n-1) or n.

Table of values

List of values

n	a(n)
1	1
2	3
3	2
4	15
5	4
6	5
7	6
8	35
9	8
10	7
11	10
12	77
13	12
14	11
15	14
16	33
17	16
18	55
19	18
20	143
21	20
22	13
23	22
24	65
25	24
26	25
27	26
28	85
29	28
30	17
31	21
32	187
33	56
34	99
35	32
36	121
37	30
38	253
39	34
40	23
41	36
42	115
43	38
44	45
45	19
46	39
47	76
48	91
49	40
50	49
51	44
52	63
53	46
54	119
55	48
56	221
57	50
58	51
59	52
60	289
61	42
62	323
63	58
64	57
65	29
66	95
67	87
68	133
69	116
70	171
71	62
72	209
73	31

n	a(n)
1	1
2	3
3	2
4	15
5	4
6	5
7	6
8	35
9	8
10	7
11	10
12	77
13	12
14	11
15	14
16	33
17	16
18	55
19	18
20	143
21	20
22	13
23	22
24	65
25	24
26	25
27	26
28	85
29	28
30	17
31	21
32	187
33	56
34	99
35	32
36	121
37	30
38	253
39	34
40	23
41	36
42	115
43	38
44	45
45	19
46	39
47	76
48	91
49	40
50	49
51	44
52	63
53	46
54	119
55	48
56	221
57	50
58	51
59	52
60	289
61	42
62	323
63	58
64	57
65	29
66	95
67	87
68	133
69	116
70	171
71	62
72	209
73	31

n	a(n)
1	1
2	3
3	2
4	15
5	4
6	5
7	6
8	35
9	8
10	7
11	10
12	77
13	12
14	11
15	14
16	33
17	16
18	55
19	18
20	143
21	20
22	13
23	22
24	65
25	24
26	25
27	26
28	85
29	28
30	17
31	21
32	187
33	56
34	99
35	32
36	121
37	30
38	253
39	34
40	23
41	36
42	115
43	38
44	45
45	19
46	39
47	76
48	91
49	40
50	49
51	44
52	63
53	46
54	119
55	48
56	221
57	50
58	51
59	52
60	289
61	42
62	323
63	58
64	57
65	29
66	95
67	87
68	133
69	116
70	171
71	62
72	209
73	31