A109849 - cp's OEIS frontend

A109849 a(1) = 1, a(2) = 2; a(n) = lcm(n, a(n-2)), a(n+1) = lcm((n+1), a(n-3)) and so on until a(2n-1) = lcm(2n-1, a(1)). Then a(2n) = lcm(2n, a(2n-2)) and so on.

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	12
7	21
8	8
9	9
10	40
11	231
12	12
13	65
14	28
15	15
16	16
17	17
18	144
19	285
20	140
21	1365
22	132
23	5313
24	120
25	225
26	104
27	189
28	84
29	145
30	60
31	93
32	32
33	33
34	544
35	3255
36	180
37	5365
38	1596
39	2457
40	520
41	9225
42	840
43	228459
44	132
45	4095
46	3220
47	13395
48	144
49	833
50	400
51	255
52	364
53	3445
54	108
55	1155

[1, 2, 3, 4, 5, 12, 21, 8, 9, 40, 231, 12, 65, 28, 15, 16, 17, 144, 285, 140, 1365, 132, 5313, 120, 225, 104, 189, 84, 145, 60, 93, 32, 33, 544, 3255, 180, 5365, 1596, 2457, 520, 9225, 840, 228459, 132, 4095, 3220, 13395, 144, 833, 400, 255, 364, 3445, 108, 1155]

cp's OEIS Frontend

A109849 a(1) = 1, a(2) = 2; a(n) = lcm(n, a(n-2)), a(n+1) = lcm((n+1), a(n-3)) and so on until a(2n-1) = lcm(2n-1, a(1)). Then a(2n) = lcm(2n, a(2n-2)) and so on.

Table of values

List of values