A357963 - cp's OEIS frontend

A357963 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 least novel multiple of any such p. 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	22
22	11
23	33
24	27
25	36
26	26
27	13
28	39
29	42
30	28
31	56
32	70
33	35
34	105
35	45
36	60
37	32
38	34
39	17
40	51
41	48
42	38
43	19
44	57
45	54
46	40
47	50
48	80
49	90
50	63
51	49
52	77
53	44
54	46
55	23
56	69
57	66
58	52
59	65
60	55
61	88
62	58
63	29
64	87
65	72
66	62
67	31
68	93

[1, 2, 4, 6, 3, 9, 12, 8, 10, 5, 15, 18, 14, 7, 21, 24, 16, 20, 25, 30, 22, 11, 33, 27, 36, 26, 13, 39, 42, 28, 56, 70, 35, 105, 45, 60, 32, 34, 17, 51, 48, 38, 19, 57, 54, 40, 50, 80, 90, 63, 49, 77, 44, 46, 23, 69, 66, 52, 65, 55, 88, 58, 29, 87, 72, 62, 31, 93]

cp's OEIS Frontend

A357963 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 least novel multiple of any such p. 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	22
22	11
23	33
24	27
25	36
26	26
27	13
28	39
29	42
30	28
31	56
32	70
33	35
34	105
35	45
36	60
37	32
38	34
39	17
40	51
41	48
42	38
43	19
44	57
45	54
46	40
47	50
48	80
49	90
50	63
51	49
52	77
53	44
54	46
55	23
56	69
57	66
58	52
59	65
60	55
61	88
62	58
63	29
64	87
65	72
66	62
67	31
68	93

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	22
22	11
23	33
24	27
25	36
26	26
27	13
28	39
29	42
30	28
31	56
32	70
33	35
34	105
35	45
36	60
37	32
38	34
39	17
40	51
41	48
42	38
43	19
44	57
45	54
46	40
47	50
48	80
49	90
50	63
51	49
52	77
53	44
54	46
55	23
56	69
57	66
58	52
59	65
60	55
61	88
62	58
63	29
64	87
65	72
66	62
67	31
68	93

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	22
22	11
23	33
24	27
25	36
26	26
27	13
28	39
29	42
30	28
31	56
32	70
33	35
34	105
35	45
36	60
37	32
38	34
39	17
40	51
41	48
42	38
43	19
44	57
45	54
46	40
47	50
48	80
49	90
50	63
51	49
52	77
53	44
54	46
55	23
56	69
57	66
58	52
59	65
60	55
61	88
62	58
63	29
64	87
65	72
66	62
67	31
68	93