A160256 - cp's OEIS frontend

A160256 a(1)=1, a(2)=2. For n >=3, a(n) = the smallest positive integer not occurring earlier in the sequence such that a(n)*a(n-1)/a(n-2) is an integer.

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	8
7	9
8	16
9	18
10	24
11	12
12	10
13	30
14	5
15	36
16	15
17	48
18	20
19	60
20	7
21	120
22	14
23	180
24	21
25	240
26	28
27	300
28	35
29	360
30	42
31	420
32	11
33	840
34	22
35	1260
36	33
37	1680
38	44
39	2100
40	55
41	2520
42	66
43	2940
44	77
45	3360
46	88
47	3780
48	110
49	378
50	165
51	126
52	220
53	63
54	440
55	189
56	880
57	567
58	1760

[1, 2, 3, 4, 6, 8, 9, 16, 18, 24, 12, 10, 30, 5, 36, 15, 48, 20, 60, 7, 120, 14, 180, 21, 240, 28, 300, 35, 360, 42, 420, 11, 840, 22, 1260, 33, 1680, 44, 2100, 55, 2520, 66, 2940, 77, 3360, 88, 3780, 110, 378, 165, 126, 220, 63, 440, 189, 880, 567, 1760]

cp's OEIS Frontend

A160256 a(1)=1, a(2)=2. For n >=3, a(n) = the smallest positive integer not occurring earlier in the sequence such that a(n)*a(n-1)/a(n-2) is an integer.

Table of values

List of values