A080032 - cp's OEIS frontend

A080032 a(n) is taken to be the smallest positive integer not already present which is consistent with the condition "n is a member of the sequence if and only if a(n) is even".

n	a(n)
0	0
1	2
2	4
3	1
4	6
5	7
6	8
7	10
8	12
9	11
10	14
11	16
12	18
13	15
14	20
15	22
16	24
17	19
18	26
19	28
20	30
21	23
22	32
23	34
24	36
25	27
26	38
27	40
28	42
29	31
30	44
31	46
32	48
33	35
34	50
35	52
36	54
37	39
38	56
39	58
40	60
41	43
42	62
43	64
44	66
45	47
46	68
47	70
48	72
49	51
50	74
51	76
52	78
53	55
54	80
55	82
56	84
57	59
58	86
59	88
60	90
61	63
62	92
63	94
64	96
65	67
66	98
67	100
68	102
69	71
70	104

[0, 2, 4, 1, 6, 7, 8, 10, 12, 11, 14, 16, 18, 15, 20, 22, 24, 19, 26, 28, 30, 23, 32, 34, 36, 27, 38, 40, 42, 31, 44, 46, 48, 35, 50, 52, 54, 39, 56, 58, 60, 43, 62, 64, 66, 47, 68, 70, 72, 51, 74, 76, 78, 55, 80, 82, 84, 59, 86, 88, 90, 63, 92, 94, 96, 67, 98, 100, 102, 71, 104]

cp's OEIS Frontend

A080032 a(n) is taken to be the smallest positive integer not already present which is consistent with the condition "n is a member of the sequence if and only if a(n) is even".

Table of values

List of values

n	a(n)
0	0
1	2
2	4
3	1
4	6
5	7
6	8
7	10
8	12
9	11
10	14
11	16
12	18
13	15
14	20
15	22
16	24
17	19
18	26
19	28
20	30
21	23
22	32
23	34
24	36
25	27
26	38
27	40
28	42
29	31
30	44
31	46
32	48
33	35
34	50
35	52
36	54
37	39
38	56
39	58
40	60
41	43
42	62
43	64
44	66
45	47
46	68
47	70
48	72
49	51
50	74
51	76
52	78
53	55
54	80
55	82
56	84
57	59
58	86
59	88
60	90
61	63
62	92
63	94
64	96
65	67
66	98
67	100
68	102
69	71
70	104

n	a(n)
0	0
1	2
2	4
3	1
4	6
5	7
6	8
7	10
8	12
9	11
10	14
11	16
12	18
13	15
14	20
15	22
16	24
17	19
18	26
19	28
20	30
21	23
22	32
23	34
24	36
25	27
26	38
27	40
28	42
29	31
30	44
31	46
32	48
33	35
34	50
35	52
36	54
37	39
38	56
39	58
40	60
41	43
42	62
43	64
44	66
45	47
46	68
47	70
48	72
49	51
50	74
51	76
52	78
53	55
54	80
55	82
56	84
57	59
58	86
59	88
60	90
61	63
62	92
63	94
64	96
65	67
66	98
67	100
68	102
69	71
70	104

n	a(n)
0	0
1	2
2	4
3	1
4	6
5	7
6	8
7	10
8	12
9	11
10	14
11	16
12	18
13	15
14	20
15	22
16	24
17	19
18	26
19	28
20	30
21	23
22	32
23	34
24	36
25	27
26	38
27	40
28	42
29	31
30	44
31	46
32	48
33	35
34	50
35	52
36	54
37	39
38	56
39	58
40	60
41	43
42	62
43	64
44	66
45	47
46	68
47	70
48	72
49	51
50	74
51	76
52	78
53	55
54	80
55	82
56	84
57	59
58	86
59	88
60	90
61	63
62	92
63	94
64	96
65	67
66	98
67	100
68	102
69	71
70	104