A379442 - cp's OEIS frontend

A379442 a(1) = 1, a(2) = 2, for a(n) > 2, a(n) is the smallest unused positive number that shares a factor with a(n-1) such that the exponents of each distinct prime factor of a(n-1) differ by one from those of the same prime factors of a(n), while the exponents of each distinct prime factor of a(n) differ by one from those of the same prime factors of a(n-1).

n	a(n)
1	1
2	2
3	4
4	6
5	9
6	3
7	18
8	12
9	8
10	16
11	24
12	20
13	14
14	44
15	10
16	25
17	5
18	50
19	15
20	63
21	27
22	45
23	21
24	49
25	7
26	98
27	28
28	22
29	52
30	30
31	36
32	42
33	68
34	26
35	60
36	34
37	76
38	40
39	48
40	32
41	64
42	96
43	80
44	56
45	92
46	38
47	84
48	46
49	116
50	62
51	132
52	58
53	124
54	66
55	117
56	33
57	90
58	39
59	99
60	51
61	126
62	57
63	153
64	54
65	81
66	135
67	162
68	108
69	72
70	156
71	70
72	75
73	35
74	147
75	77
76	121
77	11
78	242
79	55
80	150
81	65
82	169
83	13
84	338
85	91
86	245
87	119
88	289

[1, 2, 4, 6, 9, 3, 18, 12, 8, 16, 24, 20, 14, 44, 10, 25, 5, 50, 15, 63, 27, 45, 21, 49, 7, 98, 28, 22, 52, 30, 36, 42, 68, 26, 60, 34, 76, 40, 48, 32, 64, 96, 80, 56, 92, 38, 84, 46, 116, 62, 132, 58, 124, 66, 117, 33, 90, 39, 99, 51, 126, 57, 153, 54, 81, 135, 162, 108, 72, 156, 70, 75, 35, 147, 77, 121, 11, 242, 55, 150, 65, 169, 13, 338, 91, 245, 119, 289]

cp's OEIS Frontend

Table of values

List of values

n	a(n)
1	1
2	2
3	4
4	6
5	9
6	3
7	18
8	12
9	8
10	16
11	24
12	20
13	14
14	44
15	10
16	25
17	5
18	50
19	15
20	63
21	27
22	45
23	21
24	49
25	7
26	98
27	28
28	22
29	52
30	30
31	36
32	42
33	68
34	26
35	60
36	34
37	76
38	40
39	48
40	32
41	64
42	96
43	80
44	56
45	92
46	38
47	84
48	46
49	116
50	62
51	132
52	58
53	124
54	66
55	117
56	33
57	90
58	39
59	99
60	51
61	126
62	57
63	153
64	54
65	81
66	135
67	162
68	108
69	72
70	156
71	70
72	75
73	35
74	147
75	77
76	121
77	11
78	242
79	55
80	150
81	65
82	169
83	13
84	338
85	91
86	245
87	119
88	289

n	a(n)
1	1
2	2
3	4
4	6
5	9
6	3
7	18
8	12
9	8
10	16
11	24
12	20
13	14
14	44
15	10
16	25
17	5
18	50
19	15
20	63
21	27
22	45
23	21
24	49
25	7
26	98
27	28
28	22
29	52
30	30
31	36
32	42
33	68
34	26
35	60
36	34
37	76
38	40
39	48
40	32
41	64
42	96
43	80
44	56
45	92
46	38
47	84
48	46
49	116
50	62
51	132
52	58
53	124
54	66
55	117
56	33
57	90
58	39
59	99
60	51
61	126
62	57
63	153
64	54
65	81
66	135
67	162
68	108
69	72
70	156
71	70
72	75
73	35
74	147
75	77
76	121
77	11
78	242
79	55
80	150
81	65
82	169
83	13
84	338
85	91
86	245
87	119
88	289

n	a(n)
1	1
2	2
3	4
4	6
5	9
6	3
7	18
8	12
9	8
10	16
11	24
12	20
13	14
14	44
15	10
16	25
17	5
18	50
19	15
20	63
21	27
22	45
23	21
24	49
25	7
26	98
27	28
28	22
29	52
30	30
31	36
32	42
33	68
34	26
35	60
36	34
37	76
38	40
39	48
40	32
41	64
42	96
43	80
44	56
45	92
46	38
47	84
48	46
49	116
50	62
51	132
52	58
53	124
54	66
55	117
56	33
57	90
58	39
59	99
60	51
61	126
62	57
63	153
64	54
65	81
66	135
67	162
68	108
69	72
70	156
71	70
72	75
73	35
74	147
75	77
76	121
77	11
78	242
79	55
80	150
81	65
82	169
83	13
84	338
85	91
86	245
87	119
88	289