A127644 - cp's OEIS frontend

A127644 a(1)=3. a(n) is the smallest positive integer not occurring earlier in the sequence such that (sum{k=1 to n} a(k)) divides product{j=1 to n} a(j).

n	a(n)
1	3
2	6
3	9
4	18
5	12
6	16
7	8
8	24
9	32
10	34
11	30
12	48
13	15
14	1
15	14
16	2
17	17
18	11
19	20
20	4
21	26
22	7
23	21
24	22
25	5
26	27
27	10
28	13
29	25
30	40
31	19
32	28
33	33
34	37
35	23
36	42
37	38
38	44
39	35
40	31
41	41
42	29
43	46
44	49
45	39
46	50
47	36
48	43
49	47
50	45
51	51
52	54
53	55
54	53
55	52
56	56
57	57
58	62
59	61
60	60
61	64
62	68
63	67
64	58
65	63
66	70
67	69
68	71
69	65
70	77
71	66
72	72

[3, 6, 9, 18, 12, 16, 8, 24, 32, 34, 30, 48, 15, 1, 14, 2, 17, 11, 20, 4, 26, 7, 21, 22, 5, 27, 10, 13, 25, 40, 19, 28, 33, 37, 23, 42, 38, 44, 35, 31, 41, 29, 46, 49, 39, 50, 36, 43, 47, 45, 51, 54, 55, 53, 52, 56, 57, 62, 61, 60, 64, 68, 67, 58, 63, 70, 69, 71, 65, 77, 66, 72]

cp's OEIS Frontend

A127644 a(1)=3. a(n) is the smallest positive integer not occurring earlier in the sequence such that (sum{k=1 to n} a(k)) divides product{j=1 to n} a(j).

Table of values

List of values

n	a(n)
1	3
2	6
3	9
4	18
5	12
6	16
7	8
8	24
9	32
10	34
11	30
12	48
13	15
14	1
15	14
16	2
17	17
18	11
19	20
20	4
21	26
22	7
23	21
24	22
25	5
26	27
27	10
28	13
29	25
30	40
31	19
32	28
33	33
34	37
35	23
36	42
37	38
38	44
39	35
40	31
41	41
42	29
43	46
44	49
45	39
46	50
47	36
48	43
49	47
50	45
51	51
52	54
53	55
54	53
55	52
56	56
57	57
58	62
59	61
60	60
61	64
62	68
63	67
64	58
65	63
66	70
67	69
68	71
69	65
70	77
71	66
72	72

n	a(n)
1	3
2	6
3	9
4	18
5	12
6	16
7	8
8	24
9	32
10	34
11	30
12	48
13	15
14	1
15	14
16	2
17	17
18	11
19	20
20	4
21	26
22	7
23	21
24	22
25	5
26	27
27	10
28	13
29	25
30	40
31	19
32	28
33	33
34	37
35	23
36	42
37	38
38	44
39	35
40	31
41	41
42	29
43	46
44	49
45	39
46	50
47	36
48	43
49	47
50	45
51	51
52	54
53	55
54	53
55	52
56	56
57	57
58	62
59	61
60	60
61	64
62	68
63	67
64	58
65	63
66	70
67	69
68	71
69	65
70	77
71	66
72	72

n	a(n)
1	3
2	6
3	9
4	18
5	12
6	16
7	8
8	24
9	32
10	34
11	30
12	48
13	15
14	1
15	14
16	2
17	17
18	11
19	20
20	4
21	26
22	7
23	21
24	22
25	5
26	27
27	10
28	13
29	25
30	40
31	19
32	28
33	33
34	37
35	23
36	42
37	38
38	44
39	35
40	31
41	41
42	29
43	46
44	49
45	39
46	50
47	36
48	43
49	47
50	45
51	51
52	54
53	55
54	53
55	52
56	56
57	57
58	62
59	61
60	60
61	64
62	68
63	67
64	58
65	63
66	70
67	69
68	71
69	65
70	77
71	66
72	72