A249053 - cp's OEIS frontend

A249053 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 greater than a(n-1), unless a(n) is required to be prime by (ii), in which case a(n) is the smallest unused prime greater than a(n-1).

n	a(n)
1	1
2	2
3	4
4	5
5	6
6	8
7	11
8	12
9	13
10	14
11	17
12	18
13	20
14	23
15	24
16	25
17	26
18	29
19	30
20	31
21	32
22	37
23	38
24	41
25	42
26	44
27	45
28	47
29	48
30	53
31	54
32	55
33	59
34	60
35	62
36	63
37	67
38	68
39	71
40	72
41	73
42	74
43	79
44	80
45	81
46	82
47	83
48	84
49	89
50	90
51	97
52	98
53	101
54	102
55	104
56	105
57	106
58	108
59	109
60	110
61	113
62	114
63	115

[1, 2, 4, 5, 6, 8, 11, 12, 13, 14, 17, 18, 20, 23, 24, 25, 26, 29, 30, 31, 32, 37, 38, 41, 42, 44, 45, 47, 48, 53, 54, 55, 59, 60, 62, 63, 67, 68, 71, 72, 73, 74, 79, 80, 81, 82, 83, 84, 89, 90, 97, 98, 101, 102, 104, 105, 106, 108, 109, 110, 113, 114, 115]

cp's OEIS Frontend

A249053 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 greater than a(n-1), unless a(n) is required to be prime by (ii), in which case a(n) is the smallest unused prime greater than a(n-1).

Table of values

List of values

n	a(n)
1	1
2	2
3	4
4	5
5	6
6	8
7	11
8	12
9	13
10	14
11	17
12	18
13	20
14	23
15	24
16	25
17	26
18	29
19	30
20	31
21	32
22	37
23	38
24	41
25	42
26	44
27	45
28	47
29	48
30	53
31	54
32	55
33	59
34	60
35	62
36	63
37	67
38	68
39	71
40	72
41	73
42	74
43	79
44	80
45	81
46	82
47	83
48	84
49	89
50	90
51	97
52	98
53	101
54	102
55	104
56	105
57	106
58	108
59	109
60	110
61	113
62	114
63	115

n	a(n)
1	1
2	2
3	4
4	5
5	6
6	8
7	11
8	12
9	13
10	14
11	17
12	18
13	20
14	23
15	24
16	25
17	26
18	29
19	30
20	31
21	32
22	37
23	38
24	41
25	42
26	44
27	45
28	47
29	48
30	53
31	54
32	55
33	59
34	60
35	62
36	63
37	67
38	68
39	71
40	72
41	73
42	74
43	79
44	80
45	81
46	82
47	83
48	84
49	89
50	90
51	97
52	98
53	101
54	102
55	104
56	105
57	106
58	108
59	109
60	110
61	113
62	114
63	115

n	a(n)
1	1
2	2
3	4
4	5
5	6
6	8
7	11
8	12
9	13
10	14
11	17
12	18
13	20
14	23
15	24
16	25
17	26
18	29
19	30
20	31
21	32
22	37
23	38
24	41
25	42
26	44
27	45
28	47
29	48
30	53
31	54
32	55
33	59
34	60
35	62
36	63
37	67
38	68
39	71
40	72
41	73
42	74
43	79
44	80
45	81
46	82
47	83
48	84
49	89
50	90
51	97
52	98
53	101
54	102
55	104
56	105
57	106
58	108
59	109
60	110
61	113
62	114
63	115