A101369 - cp's OEIS frontend

A101369 a(2n-1) = the smallest positive integer not occurring earlier in the sequence. a(2n) = the a(2n-1)th smallest positive integer among those not occurring earlier in the sequence.

n	a(n)
1	1
2	2
3	3
4	6
5	4
6	9
7	5
8	12
9	7
10	16
11	8
12	19
13	10
14	23
15	11
16	26
17	13
18	30
19	14
20	33
21	15
22	36
23	17
24	40
25	18
26	43
27	20
28	47
29	21
30	50
31	22
32	53
33	24
34	57
35	25
36	60
37	27
38	64
39	28
40	67
41	29
42	70
43	31
44	74
45	32
46	77
47	34
48	81
49	35
50	84
51	37
52	88
53	38
54	91
55	39
56	94
57	41
58	98
59	42
60	101
61	44
62	105
63	45
64	108
65	46
66	111
67	48
68	115
69	49
70	118

[1, 2, 3, 6, 4, 9, 5, 12, 7, 16, 8, 19, 10, 23, 11, 26, 13, 30, 14, 33, 15, 36, 17, 40, 18, 43, 20, 47, 21, 50, 22, 53, 24, 57, 25, 60, 27, 64, 28, 67, 29, 70, 31, 74, 32, 77, 34, 81, 35, 84, 37, 88, 38, 91, 39, 94, 41, 98, 42, 101, 44, 105, 45, 108, 46, 111, 48, 115, 49, 118]

cp's OEIS Frontend

A101369 a(2n-1) = the smallest positive integer not occurring earlier in the sequence. a(2n) = the a(2n-1)th smallest positive integer among those not occurring earlier in the sequence.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	6
5	4
6	9
7	5
8	12
9	7
10	16
11	8
12	19
13	10
14	23
15	11
16	26
17	13
18	30
19	14
20	33
21	15
22	36
23	17
24	40
25	18
26	43
27	20
28	47
29	21
30	50
31	22
32	53
33	24
34	57
35	25
36	60
37	27
38	64
39	28
40	67
41	29
42	70
43	31
44	74
45	32
46	77
47	34
48	81
49	35
50	84
51	37
52	88
53	38
54	91
55	39
56	94
57	41
58	98
59	42
60	101
61	44
62	105
63	45
64	108
65	46
66	111
67	48
68	115
69	49
70	118

n	a(n)
1	1
2	2
3	3
4	6
5	4
6	9
7	5
8	12
9	7
10	16
11	8
12	19
13	10
14	23
15	11
16	26
17	13
18	30
19	14
20	33
21	15
22	36
23	17
24	40
25	18
26	43
27	20
28	47
29	21
30	50
31	22
32	53
33	24
34	57
35	25
36	60
37	27
38	64
39	28
40	67
41	29
42	70
43	31
44	74
45	32
46	77
47	34
48	81
49	35
50	84
51	37
52	88
53	38
54	91
55	39
56	94
57	41
58	98
59	42
60	101
61	44
62	105
63	45
64	108
65	46
66	111
67	48
68	115
69	49
70	118

n	a(n)
1	1
2	2
3	3
4	6
5	4
6	9
7	5
8	12
9	7
10	16
11	8
12	19
13	10
14	23
15	11
16	26
17	13
18	30
19	14
20	33
21	15
22	36
23	17
24	40
25	18
26	43
27	20
28	47
29	21
30	50
31	22
32	53
33	24
34	57
35	25
36	60
37	27
38	64
39	28
40	67
41	29
42	70
43	31
44	74
45	32
46	77
47	34
48	81
49	35
50	84
51	37
52	88
53	38
54	91
55	39
56	94
57	41
58	98
59	42
60	101
61	44
62	105
63	45
64	108
65	46
66	111
67	48
68	115
69	49
70	118