A118966 - cp's OEIS frontend

A118966 a(n) = (n+1)/2 if n occurs among the first n-1 terms of the sequence, otherwise a(n) = 2*n - 1.

n	a(n)
1	1
2	3
3	2
4	7
5	9
6	11
7	4
8	15
9	5
10	19
11	6
12	23
13	25
14	27
15	8
16	31
17	33
18	35
19	10
20	39
21	41
22	43
23	12
24	47
25	13
26	51
27	14
28	55
29	57
30	59
31	16
32	63
33	17
34	67
35	18
36	71
37	73
38	75
39	20
40	79
41	21
42	83
43	22
44	87
45	89
46	91
47	24
48	95
49	97
50	99
51	26
52	103
53	105
54	107
55	28
56	111
57	29
58	115
59	30
60	119
61	121
62	123
63	32
64	127
65	129
66	131
67	34
68	135

[1, 3, 2, 7, 9, 11, 4, 15, 5, 19, 6, 23, 25, 27, 8, 31, 33, 35, 10, 39, 41, 43, 12, 47, 13, 51, 14, 55, 57, 59, 16, 63, 17, 67, 18, 71, 73, 75, 20, 79, 21, 83, 22, 87, 89, 91, 24, 95, 97, 99, 26, 103, 105, 107, 28, 111, 29, 115, 30, 119, 121, 123, 32, 127, 129, 131, 34, 135]

cp's OEIS Frontend

A118966 a(n) = (n+1)/2 if n occurs among the first n-1 terms of the sequence, otherwise a(n) = 2*n - 1.

Table of values

List of values

n	a(n)
1	1
2	3
3	2
4	7
5	9
6	11
7	4
8	15
9	5
10	19
11	6
12	23
13	25
14	27
15	8
16	31
17	33
18	35
19	10
20	39
21	41
22	43
23	12
24	47
25	13
26	51
27	14
28	55
29	57
30	59
31	16
32	63
33	17
34	67
35	18
36	71
37	73
38	75
39	20
40	79
41	21
42	83
43	22
44	87
45	89
46	91
47	24
48	95
49	97
50	99
51	26
52	103
53	105
54	107
55	28
56	111
57	29
58	115
59	30
60	119
61	121
62	123
63	32
64	127
65	129
66	131
67	34
68	135

n	a(n)
1	1
2	3
3	2
4	7
5	9
6	11
7	4
8	15
9	5
10	19
11	6
12	23
13	25
14	27
15	8
16	31
17	33
18	35
19	10
20	39
21	41
22	43
23	12
24	47
25	13
26	51
27	14
28	55
29	57
30	59
31	16
32	63
33	17
34	67
35	18
36	71
37	73
38	75
39	20
40	79
41	21
42	83
43	22
44	87
45	89
46	91
47	24
48	95
49	97
50	99
51	26
52	103
53	105
54	107
55	28
56	111
57	29
58	115
59	30
60	119
61	121
62	123
63	32
64	127
65	129
66	131
67	34
68	135

n	a(n)
1	1
2	3
3	2
4	7
5	9
6	11
7	4
8	15
9	5
10	19
11	6
12	23
13	25
14	27
15	8
16	31
17	33
18	35
19	10
20	39
21	41
22	43
23	12
24	47
25	13
26	51
27	14
28	55
29	57
30	59
31	16
32	63
33	17
34	67
35	18
36	71
37	73
38	75
39	20
40	79
41	21
42	83
43	22
44	87
45	89
46	91
47	24
48	95
49	97
50	99
51	26
52	103
53	105
54	107
55	28
56	111
57	29
58	115
59	30
60	119
61	121
62	123
63	32
64	127
65	129
66	131
67	34
68	135