A255003 - cp's OEIS frontend

A255003 Lexicographically earliest permutation of positive integers such that a(a(n)+a(n+1)) is even for all n.

n	a(n)
1	1
2	2
3	4
4	3
5	5
6	6
7	8
8	10
9	7
10	9
11	12
12	11
13	13
14	14
15	15
16	16
17	18
18	20
19	17
20	19
21	22
22	21
23	24
24	26
25	23
26	25
27	28
28	27
29	30
30	29
31	32
32	31
33	33
34	34
35	35
36	36
37	38
38	40
39	37
40	39
41	42
42	41
43	44
44	43
45	46
46	45
47	47
48	48
49	50
50	52
51	49
52	51
53	54
54	53
55	56
56	55
57	58
58	57
59	60
60	59
61	62
62	61
63	64
64	66
65	63
66	65
67	68
68	67
69	70
70	69
71	72
72	71
73	73

[1, 2, 4, 3, 5, 6, 8, 10, 7, 9, 12, 11, 13, 14, 15, 16, 18, 20, 17, 19, 22, 21, 24, 26, 23, 25, 28, 27, 30, 29, 32, 31, 33, 34, 35, 36, 38, 40, 37, 39, 42, 41, 44, 43, 46, 45, 47, 48, 50, 52, 49, 51, 54, 53, 56, 55, 58, 57, 60, 59, 62, 61, 64, 66, 63, 65, 68, 67, 70, 69, 72, 71, 73]

cp's OEIS Frontend

A255003 Lexicographically earliest permutation of positive integers such that a(a(n)+a(n+1)) is even for all n.

Table of values

List of values

n	a(n)
1	1
2	2
3	4
4	3
5	5
6	6
7	8
8	10
9	7
10	9
11	12
12	11
13	13
14	14
15	15
16	16
17	18
18	20
19	17
20	19
21	22
22	21
23	24
24	26
25	23
26	25
27	28
28	27
29	30
30	29
31	32
32	31
33	33
34	34
35	35
36	36
37	38
38	40
39	37
40	39
41	42
42	41
43	44
44	43
45	46
46	45
47	47
48	48
49	50
50	52
51	49
52	51
53	54
54	53
55	56
56	55
57	58
58	57
59	60
60	59
61	62
62	61
63	64
64	66
65	63
66	65
67	68
68	67
69	70
70	69
71	72
72	71
73	73

n	a(n)
1	1
2	2
3	4
4	3
5	5
6	6
7	8
8	10
9	7
10	9
11	12
12	11
13	13
14	14
15	15
16	16
17	18
18	20
19	17
20	19
21	22
22	21
23	24
24	26
25	23
26	25
27	28
28	27
29	30
30	29
31	32
32	31
33	33
34	34
35	35
36	36
37	38
38	40
39	37
40	39
41	42
42	41
43	44
44	43
45	46
46	45
47	47
48	48
49	50
50	52
51	49
52	51
53	54
54	53
55	56
56	55
57	58
58	57
59	60
60	59
61	62
62	61
63	64
64	66
65	63
66	65
67	68
68	67
69	70
70	69
71	72
72	71
73	73

n	a(n)
1	1
2	2
3	4
4	3
5	5
6	6
7	8
8	10
9	7
10	9
11	12
12	11
13	13
14	14
15	15
16	16
17	18
18	20
19	17
20	19
21	22
22	21
23	24
24	26
25	23
26	25
27	28
28	27
29	30
30	29
31	32
32	31
33	33
34	34
35	35
36	36
37	38
38	40
39	37
40	39
41	42
42	41
43	44
44	43
45	46
46	45
47	47
48	48
49	50
50	52
51	49
52	51
53	54
54	53
55	56
56	55
57	58
58	57
59	60
60	59
61	62
62	61
63	64
64	66
65	63
66	65
67	68
68	67
69	70
70	69
71	72
72	71
73	73