A249054 - cp's OEIS frontend

A249054 Defined by (i) a(1)=1; (ii) if you move a(n) steps to the right you must reach a prime; (iii) a(n) = smallest unused composite number, unless a(n) is required to be prime by (ii), in which case a(n) is the smallest unused prime.

n	a(n)
1	1
2	2
3	4
4	3
5	6
6	8
7	5
8	9
9	10
10	12
11	7
12	11
13	14
14	13
15	15
16	16
17	17
18	19
19	23
20	18
21	20
22	29
23	31
24	21
25	22
26	24
27	37
28	25
29	26
30	41
31	27
32	43
33	28
34	47
35	30
36	32
37	53
38	59
39	33
40	34
41	61
42	67
43	35
44	36
45	71
46	38
47	73
48	39
49	40
50	79
51	83
52	42
53	89
54	97
55	101
56	44
57	45
58	103
59	46
60	48
61	107
62	49
63	50
64	109
65	113
66	51

[1, 2, 4, 3, 6, 8, 5, 9, 10, 12, 7, 11, 14, 13, 15, 16, 17, 19, 23, 18, 20, 29, 31, 21, 22, 24, 37, 25, 26, 41, 27, 43, 28, 47, 30, 32, 53, 59, 33, 34, 61, 67, 35, 36, 71, 38, 73, 39, 40, 79, 83, 42, 89, 97, 101, 44, 45, 103, 46, 48, 107, 49, 50, 109, 113, 51]

cp's OEIS Frontend

A249054 Defined by (i) a(1)=1; (ii) if you move a(n) steps to the right you must reach a prime; (iii) a(n) = smallest unused composite number, unless a(n) is required to be prime by (ii), in which case a(n) is the smallest unused prime.

Table of values

List of values

n	a(n)
1	1
2	2
3	4
4	3
5	6
6	8
7	5
8	9
9	10
10	12
11	7
12	11
13	14
14	13
15	15
16	16
17	17
18	19
19	23
20	18
21	20
22	29
23	31
24	21
25	22
26	24
27	37
28	25
29	26
30	41
31	27
32	43
33	28
34	47
35	30
36	32
37	53
38	59
39	33
40	34
41	61
42	67
43	35
44	36
45	71
46	38
47	73
48	39
49	40
50	79
51	83
52	42
53	89
54	97
55	101
56	44
57	45
58	103
59	46
60	48
61	107
62	49
63	50
64	109
65	113
66	51

n	a(n)
1	1
2	2
3	4
4	3
5	6
6	8
7	5
8	9
9	10
10	12
11	7
12	11
13	14
14	13
15	15
16	16
17	17
18	19
19	23
20	18
21	20
22	29
23	31
24	21
25	22
26	24
27	37
28	25
29	26
30	41
31	27
32	43
33	28
34	47
35	30
36	32
37	53
38	59
39	33
40	34
41	61
42	67
43	35
44	36
45	71
46	38
47	73
48	39
49	40
50	79
51	83
52	42
53	89
54	97
55	101
56	44
57	45
58	103
59	46
60	48
61	107
62	49
63	50
64	109
65	113
66	51

n	a(n)
1	1
2	2
3	4
4	3
5	6
6	8
7	5
8	9
9	10
10	12
11	7
12	11
13	14
14	13
15	15
16	16
17	17
18	19
19	23
20	18
21	20
22	29
23	31
24	21
25	22
26	24
27	37
28	25
29	26
30	41
31	27
32	43
33	28
34	47
35	30
36	32
37	53
38	59
39	33
40	34
41	61
42	67
43	35
44	36
45	71
46	38
47	73
48	39
49	40
50	79
51	83
52	42
53	89
54	97
55	101
56	44
57	45
58	103
59	46
60	48
61	107
62	49
63	50
64	109
65	113
66	51