A339107 - cp's OEIS frontend

A339107 a(1) = 3; for n>1, a(n) = the smallest positive number not occurring earlier such that a(n-1)*a(n) is divisible by a(n-1)+a(n), where a(n) is not a prime or 4.

n	a(n)
1	3
2	6
3	12
4	24
5	8
6	56
7	42
8	21
9	28
10	70
11	30
12	15
13	10
14	40
15	60
16	20
17	80
18	48
19	16
20	112
21	84
22	14
23	35
24	140
25	105
26	120
27	72
28	9
29	18
30	36
31	45
32	90
33	135
34	108
35	54
36	27
37	216
38	270
39	180
40	144
41	240
42	160
43	96
44	32
45	224
46	168
47	126
48	63
49	378
50	189
51	252
52	315
53	210
54	231
55	132
56	44
57	77
58	462
59	22
60	99
61	198
62	165
63	110
64	374
65	204
66	68
67	221
68	2652

[3, 6, 12, 24, 8, 56, 42, 21, 28, 70, 30, 15, 10, 40, 60, 20, 80, 48, 16, 112, 84, 14, 35, 140, 105, 120, 72, 9, 18, 36, 45, 90, 135, 108, 54, 27, 216, 270, 180, 144, 240, 160, 96, 32, 224, 168, 126, 63, 378, 189, 252, 315, 210, 231, 132, 44, 77, 462, 22, 99, 198, 165, 110, 374, 204, 68, 221, 2652]

cp's OEIS Frontend

A339107 a(1) = 3; for n>1, a(n) = the smallest positive number not occurring earlier such that a(n-1)*a(n) is divisible by a(n-1)+a(n), where a(n) is not a prime or 4.

Table of values

List of values