A354960 - cp's OEIS frontend

A354960 a(1) = 1, a(2) = 2; for n > 2, a(n) is the smallest positive number not occurring earlier that is a multiple of the number of proper divisors of a(n-1).

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	9
7	8
8	12
9	5
10	7
11	10
12	15
13	18
14	20
15	25
16	14
17	21
18	24
19	28
20	30
21	35
22	27
23	33
24	36
25	16
26	32
27	40
28	42
29	49
30	22
31	39
32	45
33	50
34	55
35	48
36	54
37	56
38	63
39	60
40	11
41	13
42	17
43	19
44	23
45	26
46	51
47	57
48	66
49	70
50	77
51	69
52	72
53	44
54	65
55	75
56	80
57	81
58	52
59	85
60	78
61	84
62	88
63	91
64	87
65	90
66	99
67	95
68	93
69	96
70	110
71	98
72	100
73	64
74	102
75	105
76	112

[1, 2, 3, 4, 6, 9, 8, 12, 5, 7, 10, 15, 18, 20, 25, 14, 21, 24, 28, 30, 35, 27, 33, 36, 16, 32, 40, 42, 49, 22, 39, 45, 50, 55, 48, 54, 56, 63, 60, 11, 13, 17, 19, 23, 26, 51, 57, 66, 70, 77, 69, 72, 44, 65, 75, 80, 81, 52, 85, 78, 84, 88, 91, 87, 90, 99, 95, 93, 96, 110, 98, 100, 64, 102, 105, 112]

cp's OEIS Frontend

A354960 a(1) = 1, a(2) = 2; for n > 2, a(n) is the smallest positive number not occurring earlier that is a multiple of the number of proper divisors of a(n-1).

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	9
7	8
8	12
9	5
10	7
11	10
12	15
13	18
14	20
15	25
16	14
17	21
18	24
19	28
20	30
21	35
22	27
23	33
24	36
25	16
26	32
27	40
28	42
29	49
30	22
31	39
32	45
33	50
34	55
35	48
36	54
37	56
38	63
39	60
40	11
41	13
42	17
43	19
44	23
45	26
46	51
47	57
48	66
49	70
50	77
51	69
52	72
53	44
54	65
55	75
56	80
57	81
58	52
59	85
60	78
61	84
62	88
63	91
64	87
65	90
66	99
67	95
68	93
69	96
70	110
71	98
72	100
73	64
74	102
75	105
76	112

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	9
7	8
8	12
9	5
10	7
11	10
12	15
13	18
14	20
15	25
16	14
17	21
18	24
19	28
20	30
21	35
22	27
23	33
24	36
25	16
26	32
27	40
28	42
29	49
30	22
31	39
32	45
33	50
34	55
35	48
36	54
37	56
38	63
39	60
40	11
41	13
42	17
43	19
44	23
45	26
46	51
47	57
48	66
49	70
50	77
51	69
52	72
53	44
54	65
55	75
56	80
57	81
58	52
59	85
60	78
61	84
62	88
63	91
64	87
65	90
66	99
67	95
68	93
69	96
70	110
71	98
72	100
73	64
74	102
75	105
76	112

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	9
7	8
8	12
9	5
10	7
11	10
12	15
13	18
14	20
15	25
16	14
17	21
18	24
19	28
20	30
21	35
22	27
23	33
24	36
25	16
26	32
27	40
28	42
29	49
30	22
31	39
32	45
33	50
34	55
35	48
36	54
37	56
38	63
39	60
40	11
41	13
42	17
43	19
44	23
45	26
46	51
47	57
48	66
49	70
50	77
51	69
52	72
53	44
54	65
55	75
56	80
57	81
58	52
59	85
60	78
61	84
62	88
63	91
64	87
65	90
66	99
67	95
68	93
69	96
70	110
71	98
72	100
73	64
74	102
75	105
76	112