A289509 - cp's OEIS frontend

A289509 Numbers k such that the gcd of the indices j for which the j-th prime prime(j) divides k is 1.

n	a(n)
1	2
2	4
3	6
4	8
5	10
6	12
7	14
8	15
9	16
10	18
11	20
12	22
13	24
14	26
15	28
16	30
17	32
18	33
19	34
20	35
21	36
22	38
23	40
24	42
25	44
26	45
27	46
28	48
29	50
30	51
31	52
32	54
33	55
34	56
35	58
36	60
37	62
38	64
39	66
40	68
41	69
42	70
43	72
44	74
45	75
46	76
47	77
48	78
49	80
50	82
51	84
52	85
53	86
54	88
55	90
56	92
57	93
58	94
59	95
60	96
61	98
62	99
63	100
64	102
65	104

[2, 4, 6, 8, 10, 12, 14, 15, 16, 18, 20, 22, 24, 26, 28, 30, 32, 33, 34, 35, 36, 38, 40, 42, 44, 45, 46, 48, 50, 51, 52, 54, 55, 56, 58, 60, 62, 64, 66, 68, 69, 70, 72, 74, 75, 76, 77, 78, 80, 82, 84, 85, 86, 88, 90, 92, 93, 94, 95, 96, 98, 99, 100, 102, 104]

cp's OEIS Frontend

A289509 Numbers k such that the gcd of the indices j for which the j-th prime prime(j) divides k is 1.

Table of values

List of values

n	a(n)
1	2
2	4
3	6
4	8
5	10
6	12
7	14
8	15
9	16
10	18
11	20
12	22
13	24
14	26
15	28
16	30
17	32
18	33
19	34
20	35
21	36
22	38
23	40
24	42
25	44
26	45
27	46
28	48
29	50
30	51
31	52
32	54
33	55
34	56
35	58
36	60
37	62
38	64
39	66
40	68
41	69
42	70
43	72
44	74
45	75
46	76
47	77
48	78
49	80
50	82
51	84
52	85
53	86
54	88
55	90
56	92
57	93
58	94
59	95
60	96
61	98
62	99
63	100
64	102
65	104

n	a(n)
1	2
2	4
3	6
4	8
5	10
6	12
7	14
8	15
9	16
10	18
11	20
12	22
13	24
14	26
15	28
16	30
17	32
18	33
19	34
20	35
21	36
22	38
23	40
24	42
25	44
26	45
27	46
28	48
29	50
30	51
31	52
32	54
33	55
34	56
35	58
36	60
37	62
38	64
39	66
40	68
41	69
42	70
43	72
44	74
45	75
46	76
47	77
48	78
49	80
50	82
51	84
52	85
53	86
54	88
55	90
56	92
57	93
58	94
59	95
60	96
61	98
62	99
63	100
64	102
65	104

n	a(n)
1	2
2	4
3	6
4	8
5	10
6	12
7	14
8	15
9	16
10	18
11	20
12	22
13	24
14	26
15	28
16	30
17	32
18	33
19	34
20	35
21	36
22	38
23	40
24	42
25	44
26	45
27	46
28	48
29	50
30	51
31	52
32	54
33	55
34	56
35	58
36	60
37	62
38	64
39	66
40	68
41	69
42	70
43	72
44	74
45	75
46	76
47	77
48	78
49	80
50	82
51	84
52	85
53	86
54	88
55	90
56	92
57	93
58	94
59	95
60	96
61	98
62	99
63	100
64	102
65	104