A283312 - cp's OEIS frontend

A283312 a(n) = smallest missing positive number, unless a(n-1) was a prime in which case a(n) = 2*a(n-1).

n	a(n)
1	1
2	2
3	4
4	3
5	6
6	5
7	10
8	7
9	14
10	8
11	9
12	11
13	22
14	12
15	13
16	26
17	15
18	16
19	17
20	34
21	18
22	19
23	38
24	20
25	21
26	23
27	46
28	24
29	25
30	27
31	28
32	29
33	58
34	30
35	31
36	62
37	32
38	33
39	35
40	36
41	37
42	74
43	39
44	40
45	41
46	82
47	42
48	43
49	86
50	44
51	45
52	47
53	94
54	48
55	49
56	50
57	51
58	52
59	53
60	106
61	54
62	55
63	56
64	57
65	59
66	118
67	60
68	61
69	122
70	63
71	64
72	65
73	66
74	67
75	134
76	68
77	69

[1, 2, 4, 3, 6, 5, 10, 7, 14, 8, 9, 11, 22, 12, 13, 26, 15, 16, 17, 34, 18, 19, 38, 20, 21, 23, 46, 24, 25, 27, 28, 29, 58, 30, 31, 62, 32, 33, 35, 36, 37, 74, 39, 40, 41, 82, 42, 43, 86, 44, 45, 47, 94, 48, 49, 50, 51, 52, 53, 106, 54, 55, 56, 57, 59, 118, 60, 61, 122, 63, 64, 65, 66, 67, 134, 68, 69]

cp's OEIS Frontend

A283312 a(n) = smallest missing positive number, unless a(n-1) was a prime in which case a(n) = 2*a(n-1).

Table of values

List of values

n	a(n)
1	1
2	2
3	4
4	3
5	6
6	5
7	10
8	7
9	14
10	8
11	9
12	11
13	22
14	12
15	13
16	26
17	15
18	16
19	17
20	34
21	18
22	19
23	38
24	20
25	21
26	23
27	46
28	24
29	25
30	27
31	28
32	29
33	58
34	30
35	31
36	62
37	32
38	33
39	35
40	36
41	37
42	74
43	39
44	40
45	41
46	82
47	42
48	43
49	86
50	44
51	45
52	47
53	94
54	48
55	49
56	50
57	51
58	52
59	53
60	106
61	54
62	55
63	56
64	57
65	59
66	118
67	60
68	61
69	122
70	63
71	64
72	65
73	66
74	67
75	134
76	68
77	69

n	a(n)
1	1
2	2
3	4
4	3
5	6
6	5
7	10
8	7
9	14
10	8
11	9
12	11
13	22
14	12
15	13
16	26
17	15
18	16
19	17
20	34
21	18
22	19
23	38
24	20
25	21
26	23
27	46
28	24
29	25
30	27
31	28
32	29
33	58
34	30
35	31
36	62
37	32
38	33
39	35
40	36
41	37
42	74
43	39
44	40
45	41
46	82
47	42
48	43
49	86
50	44
51	45
52	47
53	94
54	48
55	49
56	50
57	51
58	52
59	53
60	106
61	54
62	55
63	56
64	57
65	59
66	118
67	60
68	61
69	122
70	63
71	64
72	65
73	66
74	67
75	134
76	68
77	69

n	a(n)
1	1
2	2
3	4
4	3
5	6
6	5
7	10
8	7
9	14
10	8
11	9
12	11
13	22
14	12
15	13
16	26
17	15
18	16
19	17
20	34
21	18
22	19
23	38
24	20
25	21
26	23
27	46
28	24
29	25
30	27
31	28
32	29
33	58
34	30
35	31
36	62
37	32
38	33
39	35
40	36
41	37
42	74
43	39
44	40
45	41
46	82
47	42
48	43
49	86
50	44
51	45
52	47
53	94
54	48
55	49
56	50
57	51
58	52
59	53
60	106
61	54
62	55
63	56
64	57
65	59
66	118
67	60
68	61
69	122
70	63
71	64
72	65
73	66
74	67
75	134
76	68
77	69