A080639 - cp's OEIS frontend

A080639 a(1) = 1; for n>1, a(n) is taken to be the smallest integer greater than a(n-1) which is consistent with the condition "for n>1, n is a member of the sequence if and only if a(n) is even".

n	a(n)
1	1
2	2
3	5
4	7
5	8
6	9
7	10
8	12
9	14
10	16
11	17
12	18
13	19
14	20
15	21
16	22
17	24
18	26
19	28
20	30
21	32
22	34
23	35
24	36
25	37
26	38
27	39
28	40
29	41
30	42
31	43
32	44
33	45
34	46
35	48
36	50
37	52
38	54
39	56
40	58
41	60
42	62
43	64
44	66
45	68
46	70
47	71
48	72
49	73
50	74
51	75
52	76
53	77
54	78
55	79
56	80
57	81
58	82
59	83
60	84
61	85
62	86
63	87
64	88
65	89
66	90
67	91
68	92
69	93
70	94
71	96

[1, 2, 5, 7, 8, 9, 10, 12, 14, 16, 17, 18, 19, 20, 21, 22, 24, 26, 28, 30, 32, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 96]

cp's OEIS Frontend

A080639 a(1) = 1; for n>1, a(n) is taken to be the smallest integer greater than a(n-1) which is consistent with the condition "for n>1, n is a member of the sequence if and only if a(n) is even".

Table of values

List of values

n	a(n)
1	1
2	2
3	5
4	7
5	8
6	9
7	10
8	12
9	14
10	16
11	17
12	18
13	19
14	20
15	21
16	22
17	24
18	26
19	28
20	30
21	32
22	34
23	35
24	36
25	37
26	38
27	39
28	40
29	41
30	42
31	43
32	44
33	45
34	46
35	48
36	50
37	52
38	54
39	56
40	58
41	60
42	62
43	64
44	66
45	68
46	70
47	71
48	72
49	73
50	74
51	75
52	76
53	77
54	78
55	79
56	80
57	81
58	82
59	83
60	84
61	85
62	86
63	87
64	88
65	89
66	90
67	91
68	92
69	93
70	94
71	96

n	a(n)
1	1
2	2
3	5
4	7
5	8
6	9
7	10
8	12
9	14
10	16
11	17
12	18
13	19
14	20
15	21
16	22
17	24
18	26
19	28
20	30
21	32
22	34
23	35
24	36
25	37
26	38
27	39
28	40
29	41
30	42
31	43
32	44
33	45
34	46
35	48
36	50
37	52
38	54
39	56
40	58
41	60
42	62
43	64
44	66
45	68
46	70
47	71
48	72
49	73
50	74
51	75
52	76
53	77
54	78
55	79
56	80
57	81
58	82
59	83
60	84
61	85
62	86
63	87
64	88
65	89
66	90
67	91
68	92
69	93
70	94
71	96

n	a(n)
1	1
2	2
3	5
4	7
5	8
6	9
7	10
8	12
9	14
10	16
11	17
12	18
13	19
14	20
15	21
16	22
17	24
18	26
19	28
20	30
21	32
22	34
23	35
24	36
25	37
26	38
27	39
28	40
29	41
30	42
31	43
32	44
33	45
34	46
35	48
36	50
37	52
38	54
39	56
40	58
41	60
42	62
43	64
44	66
45	68
46	70
47	71
48	72
49	73
50	74
51	75
52	76
53	77
54	78
55	79
56	80
57	81
58	82
59	83
60	84
61	85
62	86
63	87
64	88
65	89
66	90
67	91
68	92
69	93
70	94
71	96