A104740 - cp's OEIS frontend

A104740 a(1) = 1; for n > 1: if n is even, a(n) = least k > 0 such that sum(i=1,n/2,a(2i-1))/sum(j=1,n,a(j))>=1/4, or 1 if there is no such k; if n is odd, a(n) = largest k > 0 such that sum(i=1,(n+1)/2,a(2i-1))/sum(j=1,n,a(j))<=1/3, or 1 if there is no such k.

n	a(n)
1	1
2	3
3	1
4	3
5	1
6	3
7	1
8	3
9	2
10	6
11	3
12	9
13	4
14	12
15	6
16	18
17	9
18	27
19	14
20	42
21	21
22	63
23	31
24	93
25	47
26	141
27	70
28	210
29	105
30	315
31	158
32	474
33	237
34	711
35	355
36	1065
37	533
38	1599
39	799
40	2397
41	1199
42	3597
43	1798
44	5394
45	2697
46	8091
47	4046
48	12138
49	6069
50	18207
51	9103
52	27309
53	13655
54	40965
55	20482
56	61446

[1, 3, 1, 3, 1, 3, 1, 3, 2, 6, 3, 9, 4, 12, 6, 18, 9, 27, 14, 42, 21, 63, 31, 93, 47, 141, 70, 210, 105, 315, 158, 474, 237, 711, 355, 1065, 533, 1599, 799, 2397, 1199, 3597, 1798, 5394, 2697, 8091, 4046, 12138, 6069, 18207, 9103, 27309, 13655, 40965, 20482, 61446]

cp's OEIS Frontend

A104740 a(1) = 1; for n > 1: if n is even, a(n) = least k > 0 such that sum(i=1,n/2,a(2i-1))/sum(j=1,n,a(j))>=1/4, or 1 if there is no such k; if n is odd, a(n) = largest k > 0 such that sum(i=1,(n+1)/2,a(2i-1))/sum(j=1,n,a(j))<=1/3, or 1 if there is no such k.

Table of values

List of values

cp's OEIS Frontend

A104740 a(1) = 1; for n > 1: if n is even, a(n) = least k > 0 such that sum(i=1,n/2,a(2*i-1))/sum(j=1,n,a(j))>=1/4, or 1 if there is no such k; if n is odd, a(n) = largest k > 0 such that sum(i=1,(n+1)/2,a(2*i-1))/sum(j=1,n,a(j))<=1/3, or 1 if there is no such k.

Table of values

List of values

A104740 a(1) = 1; for n > 1: if n is even, a(n) = least k > 0 such that sum(i=1,n/2,a(2i-1))/sum(j=1,n,a(j))>=1/4, or 1 if there is no such k; if n is odd, a(n) = largest k > 0 such that sum(i=1,(n+1)/2,a(2i-1))/sum(j=1,n,a(j))<=1/3, or 1 if there is no such k.