A335999 - cp's OEIS frontend

A335999 a(1) = 1; for n >= 2, a(n) = least positive integer not in {a(1),..., a(n-1), b(1),...,b(n-1)}, where for n >=1, b(n) = n + 2 + least positive integer not in {a(1),..., a(n-1), a(n), b(1),...,b(n-1)}.

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	8
7	10
8	11
9	13
10	14
11	16
12	17
13	19
14	21
15	22
16	24
17	26
18	27
19	29
20	31
21	32
22	34
23	35
24	37
25	39
26	40
27	42
28	43
29	45
30	47
31	48
32	50
33	51
34	53
35	55
36	56
37	58
38	60
39	61
40	63
41	64
42	66
43	68
44	69
45	71
46	73
47	74
48	76
49	77
50	79
51	81
52	82
53	84
54	86
55	87
56	89
57	90
58	92
59	94
60	95
61	97
62	98
63	100
64	102
65	103

[1, 2, 3, 4, 6, 8, 10, 11, 13, 14, 16, 17, 19, 21, 22, 24, 26, 27, 29, 31, 32, 34, 35, 37, 39, 40, 42, 43, 45, 47, 48, 50, 51, 53, 55, 56, 58, 60, 61, 63, 64, 66, 68, 69, 71, 73, 74, 76, 77, 79, 81, 82, 84, 86, 87, 89, 90, 92, 94, 95, 97, 98, 100, 102, 103]

cp's OEIS Frontend

A335999 a(1) = 1; for n >= 2, a(n) = least positive integer not in {a(1),..., a(n-1), b(1),...,b(n-1)}, where for n >=1, b(n) = n + 2 + least positive integer not in {a(1),..., a(n-1), a(n), b(1),...,b(n-1)}.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	8
7	10
8	11
9	13
10	14
11	16
12	17
13	19
14	21
15	22
16	24
17	26
18	27
19	29
20	31
21	32
22	34
23	35
24	37
25	39
26	40
27	42
28	43
29	45
30	47
31	48
32	50
33	51
34	53
35	55
36	56
37	58
38	60
39	61
40	63
41	64
42	66
43	68
44	69
45	71
46	73
47	74
48	76
49	77
50	79
51	81
52	82
53	84
54	86
55	87
56	89
57	90
58	92
59	94
60	95
61	97
62	98
63	100
64	102
65	103

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	8
7	10
8	11
9	13
10	14
11	16
12	17
13	19
14	21
15	22
16	24
17	26
18	27
19	29
20	31
21	32
22	34
23	35
24	37
25	39
26	40
27	42
28	43
29	45
30	47
31	48
32	50
33	51
34	53
35	55
36	56
37	58
38	60
39	61
40	63
41	64
42	66
43	68
44	69
45	71
46	73
47	74
48	76
49	77
50	79
51	81
52	82
53	84
54	86
55	87
56	89
57	90
58	92
59	94
60	95
61	97
62	98
63	100
64	102
65	103

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	8
7	10
8	11
9	13
10	14
11	16
12	17
13	19
14	21
15	22
16	24
17	26
18	27
19	29
20	31
21	32
22	34
23	35
24	37
25	39
26	40
27	42
28	43
29	45
30	47
31	48
32	50
33	51
34	53
35	55
36	56
37	58
38	60
39	61
40	63
41	64
42	66
43	68
44	69
45	71
46	73
47	74
48	76
49	77
50	79
51	81
52	82
53	84
54	86
55	87
56	89
57	90
58	92
59	94
60	95
61	97
62	98
63	100
64	102
65	103