A338351 - cp's OEIS frontend

A338351 Lexicographically earliest infinite sequence {a(n)} of distinct odd positive numbers such that, for n>2, a(n) has a common factor with a(n-1) but not with a(n-2).

n	a(n)
1	1
2	3
3	15
4	35
5	77
6	33
7	39
8	65
9	55
10	99
11	21
12	91
13	143
14	165
15	51
16	119
17	133
18	57
19	45
20	85
21	187
22	209
23	95
24	75
25	63
26	161
27	115
28	135
29	87
30	203
31	175
32	155
33	93
34	69
35	253
36	275
37	105
38	111
39	407
40	319
41	145
42	185
43	259
44	147
45	117
46	221
47	323
48	171
49	123
50	205
51	215
52	129
53	141
54	235
55	245
56	189
57	153
58	391
59	299
60	195
61	159
62	371

[1, 3, 15, 35, 77, 33, 39, 65, 55, 99, 21, 91, 143, 165, 51, 119, 133, 57, 45, 85, 187, 209, 95, 75, 63, 161, 115, 135, 87, 203, 175, 155, 93, 69, 253, 275, 105, 111, 407, 319, 145, 185, 259, 147, 117, 221, 323, 171, 123, 205, 215, 129, 141, 235, 245, 189, 153, 391, 299, 195, 159, 371]

cp's OEIS Frontend

A338351 Lexicographically earliest infinite sequence {a(n)} of distinct odd positive numbers such that, for n>2, a(n) has a common factor with a(n-1) but not with a(n-2).

Table of values

List of values

n	a(n)
1	1
2	3
3	15
4	35
5	77
6	33
7	39
8	65
9	55
10	99
11	21
12	91
13	143
14	165
15	51
16	119
17	133
18	57
19	45
20	85
21	187
22	209
23	95
24	75
25	63
26	161
27	115
28	135
29	87
30	203
31	175
32	155
33	93
34	69
35	253
36	275
37	105
38	111
39	407
40	319
41	145
42	185
43	259
44	147
45	117
46	221
47	323
48	171
49	123
50	205
51	215
52	129
53	141
54	235
55	245
56	189
57	153
58	391
59	299
60	195
61	159
62	371

n	a(n)
1	1
2	3
3	15
4	35
5	77
6	33
7	39
8	65
9	55
10	99
11	21
12	91
13	143
14	165
15	51
16	119
17	133
18	57
19	45
20	85
21	187
22	209
23	95
24	75
25	63
26	161
27	115
28	135
29	87
30	203
31	175
32	155
33	93
34	69
35	253
36	275
37	105
38	111
39	407
40	319
41	145
42	185
43	259
44	147
45	117
46	221
47	323
48	171
49	123
50	205
51	215
52	129
53	141
54	235
55	245
56	189
57	153
58	391
59	299
60	195
61	159
62	371

n	a(n)
1	1
2	3
3	15
4	35
5	77
6	33
7	39
8	65
9	55
10	99
11	21
12	91
13	143
14	165
15	51
16	119
17	133
18	57
19	45
20	85
21	187
22	209
23	95
24	75
25	63
26	161
27	115
28	135
29	87
30	203
31	175
32	155
33	93
34	69
35	253
36	275
37	105
38	111
39	407
40	319
41	145
42	185
43	259
44	147
45	117
46	221
47	323
48	171
49	123
50	205
51	215
52	129
53	141
54	235
55	245
56	189
57	153
58	391
59	299
60	195
61	159
62	371