A079772 - cp's OEIS frontend

A079772 Let C(n) be the n-th composite number; then a(n) is the smallest number > C(n) and not coprime to C(n).

n	a(n)
1	6
2	8
3	10
4	12
5	12
6	14
7	16
8	18
9	18
10	20
11	22
12	24
13	24
14	26
15	30
16	28
17	30
18	30
19	32
20	34
21	36
22	36
23	40
24	38
25	40
26	42
27	42
28	44
29	46
30	48
31	48
32	50
33	56
34	52
35	54
36	54
37	56
38	60
39	58
40	60
41	60
42	62
43	64
44	66
45	66
46	70
47	68
48	70
49	72
50	72
51	74
52	76
53	78
54	78
55	84
56	80
57	82
58	84
59	84
60	86
61	90
62	88
63	90
64	90
65	92
66	98
67	94
68	96
69	96
70	100

[6, 8, 10, 12, 12, 14, 16, 18, 18, 20, 22, 24, 24, 26, 30, 28, 30, 30, 32, 34, 36, 36, 40, 38, 40, 42, 42, 44, 46, 48, 48, 50, 56, 52, 54, 54, 56, 60, 58, 60, 60, 62, 64, 66, 66, 70, 68, 70, 72, 72, 74, 76, 78, 78, 84, 80, 82, 84, 84, 86, 90, 88, 90, 90, 92, 98, 94, 96, 96, 100]

cp's OEIS Frontend

A079772 Let C(n) be the n-th composite number; then a(n) is the smallest number > C(n) and not coprime to C(n).

Table of values

List of values

n	a(n)
1	6
2	8
3	10
4	12
5	12
6	14
7	16
8	18
9	18
10	20
11	22
12	24
13	24
14	26
15	30
16	28
17	30
18	30
19	32
20	34
21	36
22	36
23	40
24	38
25	40
26	42
27	42
28	44
29	46
30	48
31	48
32	50
33	56
34	52
35	54
36	54
37	56
38	60
39	58
40	60
41	60
42	62
43	64
44	66
45	66
46	70
47	68
48	70
49	72
50	72
51	74
52	76
53	78
54	78
55	84
56	80
57	82
58	84
59	84
60	86
61	90
62	88
63	90
64	90
65	92
66	98
67	94
68	96
69	96
70	100

n	a(n)
1	6
2	8
3	10
4	12
5	12
6	14
7	16
8	18
9	18
10	20
11	22
12	24
13	24
14	26
15	30
16	28
17	30
18	30
19	32
20	34
21	36
22	36
23	40
24	38
25	40
26	42
27	42
28	44
29	46
30	48
31	48
32	50
33	56
34	52
35	54
36	54
37	56
38	60
39	58
40	60
41	60
42	62
43	64
44	66
45	66
46	70
47	68
48	70
49	72
50	72
51	74
52	76
53	78
54	78
55	84
56	80
57	82
58	84
59	84
60	86
61	90
62	88
63	90
64	90
65	92
66	98
67	94
68	96
69	96
70	100

n	a(n)
1	6
2	8
3	10
4	12
5	12
6	14
7	16
8	18
9	18
10	20
11	22
12	24
13	24
14	26
15	30
16	28
17	30
18	30
19	32
20	34
21	36
22	36
23	40
24	38
25	40
26	42
27	42
28	44
29	46
30	48
31	48
32	50
33	56
34	52
35	54
36	54
37	56
38	60
39	58
40	60
41	60
42	62
43	64
44	66
45	66
46	70
47	68
48	70
49	72
50	72
51	74
52	76
53	78
54	78
55	84
56	80
57	82
58	84
59	84
60	86
61	90
62	88
63	90
64	90
65	92
66	98
67	94
68	96
69	96
70	100