A075325 - cp's OEIS frontend

A075325 Pair the natural numbers such that the m-th pair is (r, s) where r, s and s-r are the smallest numbers which have not occurred earlier and also are not equal to the difference of any earlier pair: (1, 3), (4, 9), (6, 13), (8, 18), (11, 23), (14, 29), (16, 33), (19, 39), (21, 43), (24, 49), (26, 53), (28, 58), ... Sequence gives first term of each pair.

n	a(n)
1	1
2	4
3	6
4	8
5	11
6	14
7	16
8	19
9	21
10	24
11	26
12	28
13	31
14	34
15	36
16	38
17	41
18	44
19	46
20	48
21	51
22	54
23	56
24	59
25	61
26	64
27	66
28	68
29	71
30	74
31	76
32	79
33	81
34	84
35	86
36	88
37	91
38	94
39	96
40	99
41	101
42	104
43	106
44	108
45	111
46	114
47	116
48	118
49	121
50	124
51	126
52	128
53	131
54	134
55	136
56	139
57	141
58	144
59	146
60	148
61	151
62	154
63	156

[1, 4, 6, 8, 11, 14, 16, 19, 21, 24, 26, 28, 31, 34, 36, 38, 41, 44, 46, 48, 51, 54, 56, 59, 61, 64, 66, 68, 71, 74, 76, 79, 81, 84, 86, 88, 91, 94, 96, 99, 101, 104, 106, 108, 111, 114, 116, 118, 121, 124, 126, 128, 131, 134, 136, 139, 141, 144, 146, 148, 151, 154, 156]

cp's OEIS Frontend

Table of values

List of values

n	a(n)
1	1
2	4
3	6
4	8
5	11
6	14
7	16
8	19
9	21
10	24
11	26
12	28
13	31
14	34
15	36
16	38
17	41
18	44
19	46
20	48
21	51
22	54
23	56
24	59
25	61
26	64
27	66
28	68
29	71
30	74
31	76
32	79
33	81
34	84
35	86
36	88
37	91
38	94
39	96
40	99
41	101
42	104
43	106
44	108
45	111
46	114
47	116
48	118
49	121
50	124
51	126
52	128
53	131
54	134
55	136
56	139
57	141
58	144
59	146
60	148
61	151
62	154
63	156

n	a(n)
1	1
2	4
3	6
4	8
5	11
6	14
7	16
8	19
9	21
10	24
11	26
12	28
13	31
14	34
15	36
16	38
17	41
18	44
19	46
20	48
21	51
22	54
23	56
24	59
25	61
26	64
27	66
28	68
29	71
30	74
31	76
32	79
33	81
34	84
35	86
36	88
37	91
38	94
39	96
40	99
41	101
42	104
43	106
44	108
45	111
46	114
47	116
48	118
49	121
50	124
51	126
52	128
53	131
54	134
55	136
56	139
57	141
58	144
59	146
60	148
61	151
62	154
63	156

n	a(n)
1	1
2	4
3	6
4	8
5	11
6	14
7	16
8	19
9	21
10	24
11	26
12	28
13	31
14	34
15	36
16	38
17	41
18	44
19	46
20	48
21	51
22	54
23	56
24	59
25	61
26	64
27	66
28	68
29	71
30	74
31	76
32	79
33	81
34	84
35	86
36	88
37	91
38	94
39	96
40	99
41	101
42	104
43	106
44	108
45	111
46	114
47	116
48	118
49	121
50	124
51	126
52	128
53	131
54	134
55	136
56	139
57	141
58	144
59	146
60	148
61	151
62	154
63	156