A075329 - cp's OEIS frontend

A075329 Pair up the natural numbers as (r, s) (say) so that all natural numbers are obtained only once as r, s, s+r or s-r: (1, 3), (5, 11), (7, 15), (9, 19), (12, 25), (14, 31), (18, 38), ... Sequence gives first member of each pair.

n	a(n)
1	1
2	5
3	7
4	9
5	12
6	14
7	18
8	21
9	24
10	27
11	29
12	33
13	35
14	39
15	41
16	43
17	47
18	49
19	51
20	54
21	58
22	60
23	63
24	66
25	69
26	72
27	75
28	77
29	78
30	82
31	86
32	88
33	92
34	94
35	96
36	99
37	103
38	105
39	110
40	112
41	114
42	116
43	120
44	123
45	126
46	129
47	130
48	135
49	137
50	140
51	143
52	146
53	148
54	152
55	154
56	158
57	160
58	164
59	166
60	169
61	171
62	172

[1, 5, 7, 9, 12, 14, 18, 21, 24, 27, 29, 33, 35, 39, 41, 43, 47, 49, 51, 54, 58, 60, 63, 66, 69, 72, 75, 77, 78, 82, 86, 88, 92, 94, 96, 99, 103, 105, 110, 112, 114, 116, 120, 123, 126, 129, 130, 135, 137, 140, 143, 146, 148, 152, 154, 158, 160, 164, 166, 169, 171, 172]

cp's OEIS Frontend

A075329 Pair up the natural numbers as (r, s) (say) so that all natural numbers are obtained only once as r, s, s+r or s-r: (1, 3), (5, 11), (7, 15), (9, 19), (12, 25), (14, 31), (18, 38), ... Sequence gives first member of each pair.

Table of values

List of values

n	a(n)
1	1
2	5
3	7
4	9
5	12
6	14
7	18
8	21
9	24
10	27
11	29
12	33
13	35
14	39
15	41
16	43
17	47
18	49
19	51
20	54
21	58
22	60
23	63
24	66
25	69
26	72
27	75
28	77
29	78
30	82
31	86
32	88
33	92
34	94
35	96
36	99
37	103
38	105
39	110
40	112
41	114
42	116
43	120
44	123
45	126
46	129
47	130
48	135
49	137
50	140
51	143
52	146
53	148
54	152
55	154
56	158
57	160
58	164
59	166
60	169
61	171
62	172

n	a(n)
1	1
2	5
3	7
4	9
5	12
6	14
7	18
8	21
9	24
10	27
11	29
12	33
13	35
14	39
15	41
16	43
17	47
18	49
19	51
20	54
21	58
22	60
23	63
24	66
25	69
26	72
27	75
28	77
29	78
30	82
31	86
32	88
33	92
34	94
35	96
36	99
37	103
38	105
39	110
40	112
41	114
42	116
43	120
44	123
45	126
46	129
47	130
48	135
49	137
50	140
51	143
52	146
53	148
54	152
55	154
56	158
57	160
58	164
59	166
60	169
61	171
62	172

n	a(n)
1	1
2	5
3	7
4	9
5	12
6	14
7	18
8	21
9	24
10	27
11	29
12	33
13	35
14	39
15	41
16	43
17	47
18	49
19	51
20	54
21	58
22	60
23	63
24	66
25	69
26	72
27	75
28	77
29	78
30	82
31	86
32	88
33	92
34	94
35	96
36	99
37	103
38	105
39	110
40	112
41	114
42	116
43	120
44	123
45	126
46	129
47	130
48	135
49	137
50	140
51	143
52	146
53	148
54	152
55	154
56	158
57	160
58	164
59	166
60	169
61	171
62	172