A368103 - cp's OEIS frontend

A368103 a(1)=1; for n>1, a(n) is the smallest number not already used which has a factor difference in common with a(n-1).

n	a(n)
1	1
2	4
3	9
4	16
5	7
6	27
7	40
8	10
9	18
10	8
11	3
12	15
13	24
14	6
15	2
16	12
17	5
18	21
19	32
20	45
21	13
22	28
23	54
24	26
25	42
26	20
27	30
28	14
29	36
30	17
31	57
32	80
33	35
34	48
35	23
36	75
37	11
38	39
39	56
40	72
41	22
42	46
43	94
44	144
45	19
46	63
47	88
48	43
49	135
50	55
51	91
52	112
53	25
54	49
55	64
56	31
57	99
58	120
59	38
60	60
61	29
62	93
63	128
64	33
65	65
66	84
67	41
68	129
69	176
70	50
71	66
72	92
73	141
74	192

[1, 4, 9, 16, 7, 27, 40, 10, 18, 8, 3, 15, 24, 6, 2, 12, 5, 21, 32, 45, 13, 28, 54, 26, 42, 20, 30, 14, 36, 17, 57, 80, 35, 48, 23, 75, 11, 39, 56, 72, 22, 46, 94, 144, 19, 63, 88, 43, 135, 55, 91, 112, 25, 49, 64, 31, 99, 120, 38, 60, 29, 93, 128, 33, 65, 84, 41, 129, 176, 50, 66, 92, 141, 192]

cp's OEIS Frontend

A368103 a(1)=1; for n>1, a(n) is the smallest number not already used which has a factor difference in common with a(n-1).

Table of values

List of values

n	a(n)
1	1
2	4
3	9
4	16
5	7
6	27
7	40
8	10
9	18
10	8
11	3
12	15
13	24
14	6
15	2
16	12
17	5
18	21
19	32
20	45
21	13
22	28
23	54
24	26
25	42
26	20
27	30
28	14
29	36
30	17
31	57
32	80
33	35
34	48
35	23
36	75
37	11
38	39
39	56
40	72
41	22
42	46
43	94
44	144
45	19
46	63
47	88
48	43
49	135
50	55
51	91
52	112
53	25
54	49
55	64
56	31
57	99
58	120
59	38
60	60
61	29
62	93
63	128
64	33
65	65
66	84
67	41
68	129
69	176
70	50
71	66
72	92
73	141
74	192

n	a(n)
1	1
2	4
3	9
4	16
5	7
6	27
7	40
8	10
9	18
10	8
11	3
12	15
13	24
14	6
15	2
16	12
17	5
18	21
19	32
20	45
21	13
22	28
23	54
24	26
25	42
26	20
27	30
28	14
29	36
30	17
31	57
32	80
33	35
34	48
35	23
36	75
37	11
38	39
39	56
40	72
41	22
42	46
43	94
44	144
45	19
46	63
47	88
48	43
49	135
50	55
51	91
52	112
53	25
54	49
55	64
56	31
57	99
58	120
59	38
60	60
61	29
62	93
63	128
64	33
65	65
66	84
67	41
68	129
69	176
70	50
71	66
72	92
73	141
74	192

n	a(n)
1	1
2	4
3	9
4	16
5	7
6	27
7	40
8	10
9	18
10	8
11	3
12	15
13	24
14	6
15	2
16	12
17	5
18	21
19	32
20	45
21	13
22	28
23	54
24	26
25	42
26	20
27	30
28	14
29	36
30	17
31	57
32	80
33	35
34	48
35	23
36	75
37	11
38	39
39	56
40	72
41	22
42	46
43	94
44	144
45	19
46	63
47	88
48	43
49	135
50	55
51	91
52	112
53	25
54	49
55	64
56	31
57	99
58	120
59	38
60	60
61	29
62	93
63	128
64	33
65	65
66	84
67	41
68	129
69	176
70	50
71	66
72	92
73	141
74	192