A358026 - cp's OEIS frontend

A358026 Let G(n) = gcd(a(n-2),a(n-1)), a(1)=1, a(2)=2, a(3)=3. Thereafter if G(n) = 1, a(n) is the least novel m sharing a divisor with both a(n-2) and a(n-1). If G(n) > 1 and every prime divisor of a(n-1) also divides a(n-2), a(n) is the least m prime to both a(n-1) and a(n-2). Otherwise a(n) is the least novel multiple of any prime divisor of a(n-1) which does not divide a(n-2).

n	a(n)
1	1
2	2
3	3
4	6
5	4
6	5
7	10
8	8
9	7
10	14
11	12
12	9
13	11
14	33
15	15
16	20
17	16
18	13
19	26
20	18
21	21
22	28
23	22
24	44
25	17
26	34
27	24
28	27
29	19
30	57
31	30
32	25
33	23
34	115
35	35
36	42
37	32
38	29
39	58
40	36
41	39
42	52
43	38
44	76
45	31
46	62
47	40
48	45
49	48
50	46
51	69
52	51
53	68
54	50
55	55
56	66
57	54
58	37
59	74
60	56
61	49
62	41
63	287
64	63
65	60
66	64
67	43

[1, 2, 3, 6, 4, 5, 10, 8, 7, 14, 12, 9, 11, 33, 15, 20, 16, 13, 26, 18, 21, 28, 22, 44, 17, 34, 24, 27, 19, 57, 30, 25, 23, 115, 35, 42, 32, 29, 58, 36, 39, 52, 38, 76, 31, 62, 40, 45, 48, 46, 69, 51, 68, 50, 55, 66, 54, 37, 74, 56, 49, 41, 287, 63, 60, 64, 43]

cp's OEIS Frontend

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	6
5	4
6	5
7	10
8	8
9	7
10	14
11	12
12	9
13	11
14	33
15	15
16	20
17	16
18	13
19	26
20	18
21	21
22	28
23	22
24	44
25	17
26	34
27	24
28	27
29	19
30	57
31	30
32	25
33	23
34	115
35	35
36	42
37	32
38	29
39	58
40	36
41	39
42	52
43	38
44	76
45	31
46	62
47	40
48	45
49	48
50	46
51	69
52	51
53	68
54	50
55	55
56	66
57	54
58	37
59	74
60	56
61	49
62	41
63	287
64	63
65	60
66	64
67	43

n	a(n)
1	1
2	2
3	3
4	6
5	4
6	5
7	10
8	8
9	7
10	14
11	12
12	9
13	11
14	33
15	15
16	20
17	16
18	13
19	26
20	18
21	21
22	28
23	22
24	44
25	17
26	34
27	24
28	27
29	19
30	57
31	30
32	25
33	23
34	115
35	35
36	42
37	32
38	29
39	58
40	36
41	39
42	52
43	38
44	76
45	31
46	62
47	40
48	45
49	48
50	46
51	69
52	51
53	68
54	50
55	55
56	66
57	54
58	37
59	74
60	56
61	49
62	41
63	287
64	63
65	60
66	64
67	43

n	a(n)
1	1
2	2
3	3
4	6
5	4
6	5
7	10
8	8
9	7
10	14
11	12
12	9
13	11
14	33
15	15
16	20
17	16
18	13
19	26
20	18
21	21
22	28
23	22
24	44
25	17
26	34
27	24
28	27
29	19
30	57
31	30
32	25
33	23
34	115
35	35
36	42
37	32
38	29
39	58
40	36
41	39
42	52
43	38
44	76
45	31
46	62
47	40
48	45
49	48
50	46
51	69
52	51
53	68
54	50
55	55
56	66
57	54
58	37
59	74
60	56
61	49
62	41
63	287
64	63
65	60
66	64
67	43