A155878 - cp's OEIS frontend

A155878 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	8
2	10
3	12
4	14
5	15
6	16
7	18
8	20
9	21
10	22
11	24
12	26
13	27
14	28
15	30
16	32
17	33
18	34
19	35
20	36
21	39
22	40
23	42
24	44
25	45
26	46
27	48
28	49
29	51
30	52
31	54
32	55
33	57
34	58
35	60
36	62
37	63
38	64
39	65
40	66
41	69
42	70
43	72
44	74
45	75
46	76
47	77
48	78
49	80
50	82
51	84
52	86
53	87
54	88
55	90
56	91
57	93
58	94
59	95
60	96
61	98
62	99
63	102
64	104
65	105
66	106
67	108

[4, 8, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 26, 27, 28, 30, 32, 33, 34, 35, 36, 39, 40, 42, 44, 45, 46, 48, 49, 51, 52, 54, 55, 57, 58, 60, 62, 63, 64, 65, 66, 69, 70, 72, 74, 75, 76, 77, 78, 80, 82, 84, 86, 87, 88, 90, 91, 93, 94, 95, 96, 98, 99, 102, 104, 105, 106, 108]

cp's OEIS Frontend

A155878 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	8
2	10
3	12
4	14
5	15
6	16
7	18
8	20
9	21
10	22
11	24
12	26
13	27
14	28
15	30
16	32
17	33
18	34
19	35
20	36
21	39
22	40
23	42
24	44
25	45
26	46
27	48
28	49
29	51
30	52
31	54
32	55
33	57
34	58
35	60
36	62
37	63
38	64
39	65
40	66
41	69
42	70
43	72
44	74
45	75
46	76
47	77
48	78
49	80
50	82
51	84
52	86
53	87
54	88
55	90
56	91
57	93
58	94
59	95
60	96
61	98
62	99
63	102
64	104
65	105
66	106
67	108

n	a(n)
0	4
1	8
2	10
3	12
4	14
5	15
6	16
7	18
8	20
9	21
10	22
11	24
12	26
13	27
14	28
15	30
16	32
17	33
18	34
19	35
20	36
21	39
22	40
23	42
24	44
25	45
26	46
27	48
28	49
29	51
30	52
31	54
32	55
33	57
34	58
35	60
36	62
37	63
38	64
39	65
40	66
41	69
42	70
43	72
44	74
45	75
46	76
47	77
48	78
49	80
50	82
51	84
52	86
53	87
54	88
55	90
56	91
57	93
58	94
59	95
60	96
61	98
62	99
63	102
64	104
65	105
66	106
67	108

n	a(n)
0	4
1	8
2	10
3	12
4	14
5	15
6	16
7	18
8	20
9	21
10	22
11	24
12	26
13	27
14	28
15	30
16	32
17	33
18	34
19	35
20	36
21	39
22	40
23	42
24	44
25	45
26	46
27	48
28	49
29	51
30	52
31	54
32	55
33	57
34	58
35	60
36	62
37	63
38	64
39	65
40	66
41	69
42	70
43	72
44	74
45	75
46	76
47	77
48	78
49	80
50	82
51	84
52	86
53	87
54	88
55	90
56	91
57	93
58	94
59	95
60	96
61	98
62	99
63	102
64	104
65	105
66	106
67	108