A072939 - cp's OEIS frontend

A072939 Define a sequence c depending on n as follows: c(1)=1 and c(2)=n; c(k+2) = (c(k+1) + c(k))/2 if c(k+1) and c(k) have the same parity; otherwise c(k+2) = abs(c(k+1) - 2*c(k)); sequence gives values of n such that lim_{k->oo} c(k) = infinity.

n	a(n)
1	3
2	7
3	9
4	11
5	15
6	19
7	23
8	25
9	27
10	31
11	33
12	35
13	39
14	41
15	43
16	47
17	51
18	55
19	57
20	59
21	63
22	67
23	71
24	73
25	75
26	79
27	83
28	87
29	89
30	91
31	95
32	97
33	99
34	103
35	105
36	107
37	111
38	115
39	119
40	121
41	123
42	127
43	129
44	131
45	135
46	137
47	139
48	143
49	147
50	151
51	153
52	155
53	159
54	161
55	163
56	167
57	169
58	171
59	175
60	179

[3, 7, 9, 11, 15, 19, 23, 25, 27, 31, 33, 35, 39, 41, 43, 47, 51, 55, 57, 59, 63, 67, 71, 73, 75, 79, 83, 87, 89, 91, 95, 97, 99, 103, 105, 107, 111, 115, 119, 121, 123, 127, 129, 131, 135, 137, 139, 143, 147, 151, 153, 155, 159, 161, 163, 167, 169, 171, 175, 179]

cp's OEIS Frontend

A072939 Define a sequence c depending on n as follows: c(1)=1 and c(2)=n; c(k+2) = (c(k+1) + c(k))/2 if c(k+1) and c(k) have the same parity; otherwise c(k+2) = abs(c(k+1) - 2*c(k)); sequence gives values of n such that lim_{k->oo} c(k) = infinity.

Table of values

List of values

n	a(n)
1	3
2	7
3	9
4	11
5	15
6	19
7	23
8	25
9	27
10	31
11	33
12	35
13	39
14	41
15	43
16	47
17	51
18	55
19	57
20	59
21	63
22	67
23	71
24	73
25	75
26	79
27	83
28	87
29	89
30	91
31	95
32	97
33	99
34	103
35	105
36	107
37	111
38	115
39	119
40	121
41	123
42	127
43	129
44	131
45	135
46	137
47	139
48	143
49	147
50	151
51	153
52	155
53	159
54	161
55	163
56	167
57	169
58	171
59	175
60	179

n	a(n)
1	3
2	7
3	9
4	11
5	15
6	19
7	23
8	25
9	27
10	31
11	33
12	35
13	39
14	41
15	43
16	47
17	51
18	55
19	57
20	59
21	63
22	67
23	71
24	73
25	75
26	79
27	83
28	87
29	89
30	91
31	95
32	97
33	99
34	103
35	105
36	107
37	111
38	115
39	119
40	121
41	123
42	127
43	129
44	131
45	135
46	137
47	139
48	143
49	147
50	151
51	153
52	155
53	159
54	161
55	163
56	167
57	169
58	171
59	175
60	179

n	a(n)
1	3
2	7
3	9
4	11
5	15
6	19
7	23
8	25
9	27
10	31
11	33
12	35
13	39
14	41
15	43
16	47
17	51
18	55
19	57
20	59
21	63
22	67
23	71
24	73
25	75
26	79
27	83
28	87
29	89
30	91
31	95
32	97
33	99
34	103
35	105
36	107
37	111
38	115
39	119
40	121
41	123
42	127
43	129
44	131
45	135
46	137
47	139
48	143
49	147
50	151
51	153
52	155
53	159
54	161
55	163
56	167
57	169
58	171
59	175
60	179