A357994 - cp's OEIS frontend

A357994 a(1)=1, a(2)=2. Thereafter, if there are prime divisors p of a(n-1) which do not divide a(n-2), a(n) is the greatest least multiple of any such p which has not already occurred. Otherwise a(n) is the least novel multiple of the squarefree kernel of a(n-1). (see comments).

n	a(n)
1	1
2	2
3	4
4	6
5	3
6	9
7	12
8	8
9	10
10	5
11	15
12	18
13	14
14	7
15	21
16	24
17	16
18	20
19	25
20	30
21	27
22	33
23	11
24	22
25	26
26	13
27	39
28	36
29	28
30	35
31	40
32	32
33	34
34	17
35	51
36	42
37	49
38	56
39	38
40	19
41	57
42	45
43	50
44	44
45	55
46	60
47	48
48	54
49	66
50	77
51	63
52	69
53	23
54	46
55	52
56	65
57	70
58	84
59	72
60	78
61	91
62	98
63	58
64	29
65	87
66	75
67	80
68	62

[1, 2, 4, 6, 3, 9, 12, 8, 10, 5, 15, 18, 14, 7, 21, 24, 16, 20, 25, 30, 27, 33, 11, 22, 26, 13, 39, 36, 28, 35, 40, 32, 34, 17, 51, 42, 49, 56, 38, 19, 57, 45, 50, 44, 55, 60, 48, 54, 66, 77, 63, 69, 23, 46, 52, 65, 70, 84, 72, 78, 91, 98, 58, 29, 87, 75, 80, 62]

cp's OEIS Frontend

A357994 a(1)=1, a(2)=2. Thereafter, if there are prime divisors p of a(n-1) which do not divide a(n-2), a(n) is the greatest least multiple of any such p which has not already occurred. Otherwise a(n) is the least novel multiple of the squarefree kernel of a(n-1). (see comments).

Table of values

List of values

n	a(n)
1	1
2	2
3	4
4	6
5	3
6	9
7	12
8	8
9	10
10	5
11	15
12	18
13	14
14	7
15	21
16	24
17	16
18	20
19	25
20	30
21	27
22	33
23	11
24	22
25	26
26	13
27	39
28	36
29	28
30	35
31	40
32	32
33	34
34	17
35	51
36	42
37	49
38	56
39	38
40	19
41	57
42	45
43	50
44	44
45	55
46	60
47	48
48	54
49	66
50	77
51	63
52	69
53	23
54	46
55	52
56	65
57	70
58	84
59	72
60	78
61	91
62	98
63	58
64	29
65	87
66	75
67	80
68	62

n	a(n)
1	1
2	2
3	4
4	6
5	3
6	9
7	12
8	8
9	10
10	5
11	15
12	18
13	14
14	7
15	21
16	24
17	16
18	20
19	25
20	30
21	27
22	33
23	11
24	22
25	26
26	13
27	39
28	36
29	28
30	35
31	40
32	32
33	34
34	17
35	51
36	42
37	49
38	56
39	38
40	19
41	57
42	45
43	50
44	44
45	55
46	60
47	48
48	54
49	66
50	77
51	63
52	69
53	23
54	46
55	52
56	65
57	70
58	84
59	72
60	78
61	91
62	98
63	58
64	29
65	87
66	75
67	80
68	62

n	a(n)
1	1
2	2
3	4
4	6
5	3
6	9
7	12
8	8
9	10
10	5
11	15
12	18
13	14
14	7
15	21
16	24
17	16
18	20
19	25
20	30
21	27
22	33
23	11
24	22
25	26
26	13
27	39
28	36
29	28
30	35
31	40
32	32
33	34
34	17
35	51
36	42
37	49
38	56
39	38
40	19
41	57
42	45
43	50
44	44
45	55
46	60
47	48
48	54
49	66
50	77
51	63
52	69
53	23
54	46
55	52
56	65
57	70
58	84
59	72
60	78
61	91
62	98
63	58
64	29
65	87
66	75
67	80
68	62