A354087 - cp's OEIS frontend

A354087 a(1) = 1; for n > 1, a(n) is the smallest positive number that has not yet appeared that shares a factor with a(n-1) and whose binary expansion has a single 1-bit in common with the binary expansion of a(n-1).

n	a(n)
1	1
2	3
3	6
4	2
5	10
6	8
7	12
8	4
9	14
10	18
11	15
12	20
13	5
14	25
15	35
16	21
17	9
18	24
19	16
20	22
21	11
22	33
23	27
24	48
25	26
26	13
27	52
28	32
29	34
30	30
31	36
32	28
33	7
34	42
35	49
36	77
37	56
38	38
39	19
40	133
41	57
42	69
43	46
44	66
45	39
46	65
47	45
48	50
49	40
50	54
51	68
52	44
53	70
54	58
55	72
56	60
57	74
58	64
59	76
60	80
61	55
62	88
63	96
64	51
65	78
66	81
67	102
68	130
69	62
70	132
71	63
72	129
73	43
74	86
75	104
76	82

[1, 3, 6, 2, 10, 8, 12, 4, 14, 18, 15, 20, 5, 25, 35, 21, 9, 24, 16, 22, 11, 33, 27, 48, 26, 13, 52, 32, 34, 30, 36, 28, 7, 42, 49, 77, 56, 38, 19, 133, 57, 69, 46, 66, 39, 65, 45, 50, 40, 54, 68, 44, 70, 58, 72, 60, 74, 64, 76, 80, 55, 88, 96, 51, 78, 81, 102, 130, 62, 132, 63, 129, 43, 86, 104, 82]

cp's OEIS Frontend

A354087 a(1) = 1; for n > 1, a(n) is the smallest positive number that has not yet appeared that shares a factor with a(n-1) and whose binary expansion has a single 1-bit in common with the binary expansion of a(n-1).

Table of values

List of values

n	a(n)
1	1
2	3
3	6
4	2
5	10
6	8
7	12
8	4
9	14
10	18
11	15
12	20
13	5
14	25
15	35
16	21
17	9
18	24
19	16
20	22
21	11
22	33
23	27
24	48
25	26
26	13
27	52
28	32
29	34
30	30
31	36
32	28
33	7
34	42
35	49
36	77
37	56
38	38
39	19
40	133
41	57
42	69
43	46
44	66
45	39
46	65
47	45
48	50
49	40
50	54
51	68
52	44
53	70
54	58
55	72
56	60
57	74
58	64
59	76
60	80
61	55
62	88
63	96
64	51
65	78
66	81
67	102
68	130
69	62
70	132
71	63
72	129
73	43
74	86
75	104
76	82

n	a(n)
1	1
2	3
3	6
4	2
5	10
6	8
7	12
8	4
9	14
10	18
11	15
12	20
13	5
14	25
15	35
16	21
17	9
18	24
19	16
20	22
21	11
22	33
23	27
24	48
25	26
26	13
27	52
28	32
29	34
30	30
31	36
32	28
33	7
34	42
35	49
36	77
37	56
38	38
39	19
40	133
41	57
42	69
43	46
44	66
45	39
46	65
47	45
48	50
49	40
50	54
51	68
52	44
53	70
54	58
55	72
56	60
57	74
58	64
59	76
60	80
61	55
62	88
63	96
64	51
65	78
66	81
67	102
68	130
69	62
70	132
71	63
72	129
73	43
74	86
75	104
76	82

n	a(n)
1	1
2	3
3	6
4	2
5	10
6	8
7	12
8	4
9	14
10	18
11	15
12	20
13	5
14	25
15	35
16	21
17	9
18	24
19	16
20	22
21	11
22	33
23	27
24	48
25	26
26	13
27	52
28	32
29	34
30	30
31	36
32	28
33	7
34	42
35	49
36	77
37	56
38	38
39	19
40	133
41	57
42	69
43	46
44	66
45	39
46	65
47	45
48	50
49	40
50	54
51	68
52	44
53	70
54	58
55	72
56	60
57	74
58	64
59	76
60	80
61	55
62	88
63	96
64	51
65	78
66	81
67	102
68	130
69	62
70	132
71	63
72	129
73	43
74	86
75	104
76	82