A075333 - cp's OEIS frontend

A075333 Pair up the natural numbers as (r, s) (say) so that all natural numbers are obtained only once as r, s, s+r, s-r or r*s: (2, 3), (4, 11), (8, 17), (10, 22), (13, 27), (16, 34), ... Sequence gives first member of each pair.

n	a(n)
1	2
2	4
3	8
4	10
5	13
6	16
7	19
8	21
9	23
10	28
11	30
12	33
13	36
14	38
15	42
16	43
17	48
18	52
19	54
20	55
21	60
22	63
23	65
24	69
25	71
26	75
27	77
28	80
29	82
30	84
31	87
32	92
33	94
34	96
35	98
36	102
37	104
38	107
39	111
40	113
41	116
42	119
43	121
44	124
45	126
46	128
47	134
48	137
49	140
50	142
51	144
52	148
53	150
54	153
55	154
56	159
57	162
58	166
59	168
60	172
61	174

[2, 4, 8, 10, 13, 16, 19, 21, 23, 28, 30, 33, 36, 38, 42, 43, 48, 52, 54, 55, 60, 63, 65, 69, 71, 75, 77, 80, 82, 84, 87, 92, 94, 96, 98, 102, 104, 107, 111, 113, 116, 119, 121, 124, 126, 128, 134, 137, 140, 142, 144, 148, 150, 153, 154, 159, 162, 166, 168, 172, 174]

cp's OEIS Frontend

A075333 Pair up the natural numbers as (r, s) (say) so that all natural numbers are obtained only once as r, s, s+r, s-r or r*s: (2, 3), (4, 11), (8, 17), (10, 22), (13, 27), (16, 34), ... Sequence gives first member of each pair.

Table of values

List of values

n	a(n)
1	2
2	4
3	8
4	10
5	13
6	16
7	19
8	21
9	23
10	28
11	30
12	33
13	36
14	38
15	42
16	43
17	48
18	52
19	54
20	55
21	60
22	63
23	65
24	69
25	71
26	75
27	77
28	80
29	82
30	84
31	87
32	92
33	94
34	96
35	98
36	102
37	104
38	107
39	111
40	113
41	116
42	119
43	121
44	124
45	126
46	128
47	134
48	137
49	140
50	142
51	144
52	148
53	150
54	153
55	154
56	159
57	162
58	166
59	168
60	172
61	174

n	a(n)
1	2
2	4
3	8
4	10
5	13
6	16
7	19
8	21
9	23
10	28
11	30
12	33
13	36
14	38
15	42
16	43
17	48
18	52
19	54
20	55
21	60
22	63
23	65
24	69
25	71
26	75
27	77
28	80
29	82
30	84
31	87
32	92
33	94
34	96
35	98
36	102
37	104
38	107
39	111
40	113
41	116
42	119
43	121
44	124
45	126
46	128
47	134
48	137
49	140
50	142
51	144
52	148
53	150
54	153
55	154
56	159
57	162
58	166
59	168
60	172
61	174

n	a(n)
1	2
2	4
3	8
4	10
5	13
6	16
7	19
8	21
9	23
10	28
11	30
12	33
13	36
14	38
15	42
16	43
17	48
18	52
19	54
20	55
21	60
22	63
23	65
24	69
25	71
26	75
27	77
28	80
29	82
30	84
31	87
32	92
33	94
34	96
35	98
36	102
37	104
38	107
39	111
40	113
41	116
42	119
43	121
44	124
45	126
46	128
47	134
48	137
49	140
50	142
51	144
52	148
53	150
54	153
55	154
56	159
57	162
58	166
59	168
60	172
61	174