A155879 - cp's OEIS frontend

A155879 a(0) = 4; for n > 0, a(n) is the smallest composite number c > a(n-1) such that c - n is also composite.

n	a(n)
0	4
1	9
2	10
3	12
4	14
5	15
6	16
7	21
8	22
9	24
10	25
11	26
12	27
13	28
14	30
15	33
16	34
17	35
18	36
19	39
20	40
21	42
22	44
23	45
24	46
25	49
26	50
27	51
28	52
29	54
30	55
31	56
32	57
33	58
34	60
35	62
36	63
37	64
38	65
39	66
40	68
41	69
42	70
43	75
44	76
45	77
46	78
47	80
48	81
49	82
50	84
51	85
52	86
53	87
54	88
55	90
56	91
57	92
58	93
59	94
60	95
61	96
62	98
63	99
64	100
65	104
66	105
67	106
68	108

[4, 9, 10, 12, 14, 15, 16, 21, 22, 24, 25, 26, 27, 28, 30, 33, 34, 35, 36, 39, 40, 42, 44, 45, 46, 49, 50, 51, 52, 54, 55, 56, 57, 58, 60, 62, 63, 64, 65, 66, 68, 69, 70, 75, 76, 77, 78, 80, 81, 82, 84, 85, 86, 87, 88, 90, 91, 92, 93, 94, 95, 96, 98, 99, 100, 104, 105, 106, 108]

cp's OEIS Frontend

A155879 a(0) = 4; for n > 0, a(n) is the smallest composite number c > a(n-1) such that c - n is also composite.

Table of values

List of values

n	a(n)
0	4
1	9
2	10
3	12
4	14
5	15
6	16
7	21
8	22
9	24
10	25
11	26
12	27
13	28
14	30
15	33
16	34
17	35
18	36
19	39
20	40
21	42
22	44
23	45
24	46
25	49
26	50
27	51
28	52
29	54
30	55
31	56
32	57
33	58
34	60
35	62
36	63
37	64
38	65
39	66
40	68
41	69
42	70
43	75
44	76
45	77
46	78
47	80
48	81
49	82
50	84
51	85
52	86
53	87
54	88
55	90
56	91
57	92
58	93
59	94
60	95
61	96
62	98
63	99
64	100
65	104
66	105
67	106
68	108

n	a(n)
0	4
1	9
2	10
3	12
4	14
5	15
6	16
7	21
8	22
9	24
10	25
11	26
12	27
13	28
14	30
15	33
16	34
17	35
18	36
19	39
20	40
21	42
22	44
23	45
24	46
25	49
26	50
27	51
28	52
29	54
30	55
31	56
32	57
33	58
34	60
35	62
36	63
37	64
38	65
39	66
40	68
41	69
42	70
43	75
44	76
45	77
46	78
47	80
48	81
49	82
50	84
51	85
52	86
53	87
54	88
55	90
56	91
57	92
58	93
59	94
60	95
61	96
62	98
63	99
64	100
65	104
66	105
67	106
68	108

n	a(n)
0	4
1	9
2	10
3	12
4	14
5	15
6	16
7	21
8	22
9	24
10	25
11	26
12	27
13	28
14	30
15	33
16	34
17	35
18	36
19	39
20	40
21	42
22	44
23	45
24	46
25	49
26	50
27	51
28	52
29	54
30	55
31	56
32	57
33	58
34	60
35	62
36	63
37	64
38	65
39	66
40	68
41	69
42	70
43	75
44	76
45	77
46	78
47	80
48	81
49	82
50	84
51	85
52	86
53	87
54	88
55	90
56	91
57	92
58	93
59	94
60	95
61	96
62	98
63	99
64	100
65	104
66	105
67	106
68	108