A132009 - cp's OEIS frontend

A132009 a(1) = 1; for n>=2, a(n) = n-th positive integer which is coprime to the largest prime divisor of n.

n	a(n)
1	1
2	3
3	4
4	7
5	6
6	8
7	8
8	15
9	13
10	12
11	12
12	17
13	14
14	16
15	18
16	31
17	18
18	26
19	20
20	24
21	24
22	24
23	24
24	35
25	31
26	28
27	40
28	32
29	30
30	37
31	32
32	63
33	36
34	36
35	40
36	53
37	38
38	40
39	42
40	49
41	42
42	48
43	44
44	48
45	56
46	48
47	48
48	71
49	57
50	62
51	54
52	56
53	54
54	80
55	60
56	65
57	60
58	60
59	60
60	74
61	62
62	64
63	73
64	127
65	70
66	72
67	68
68	72
69	72
70	81
71	72
72	107

[1, 3, 4, 7, 6, 8, 8, 15, 13, 12, 12, 17, 14, 16, 18, 31, 18, 26, 20, 24, 24, 24, 24, 35, 31, 28, 40, 32, 30, 37, 32, 63, 36, 36, 40, 53, 38, 40, 42, 49, 42, 48, 44, 48, 56, 48, 48, 71, 57, 62, 54, 56, 54, 80, 60, 65, 60, 60, 60, 74, 62, 64, 73, 127, 70, 72, 68, 72, 72, 81, 72, 107]

cp's OEIS Frontend

A132009 a(1) = 1; for n>=2, a(n) = n-th positive integer which is coprime to the largest prime divisor of n.

Table of values

List of values

n	a(n)
1	1
2	3
3	4
4	7
5	6
6	8
7	8
8	15
9	13
10	12
11	12
12	17
13	14
14	16
15	18
16	31
17	18
18	26
19	20
20	24
21	24
22	24
23	24
24	35
25	31
26	28
27	40
28	32
29	30
30	37
31	32
32	63
33	36
34	36
35	40
36	53
37	38
38	40
39	42
40	49
41	42
42	48
43	44
44	48
45	56
46	48
47	48
48	71
49	57
50	62
51	54
52	56
53	54
54	80
55	60
56	65
57	60
58	60
59	60
60	74
61	62
62	64
63	73
64	127
65	70
66	72
67	68
68	72
69	72
70	81
71	72
72	107

n	a(n)
1	1
2	3
3	4
4	7
5	6
6	8
7	8
8	15
9	13
10	12
11	12
12	17
13	14
14	16
15	18
16	31
17	18
18	26
19	20
20	24
21	24
22	24
23	24
24	35
25	31
26	28
27	40
28	32
29	30
30	37
31	32
32	63
33	36
34	36
35	40
36	53
37	38
38	40
39	42
40	49
41	42
42	48
43	44
44	48
45	56
46	48
47	48
48	71
49	57
50	62
51	54
52	56
53	54
54	80
55	60
56	65
57	60
58	60
59	60
60	74
61	62
62	64
63	73
64	127
65	70
66	72
67	68
68	72
69	72
70	81
71	72
72	107

n	a(n)
1	1
2	3
3	4
4	7
5	6
6	8
7	8
8	15
9	13
10	12
11	12
12	17
13	14
14	16
15	18
16	31
17	18
18	26
19	20
20	24
21	24
22	24
23	24
24	35
25	31
26	28
27	40
28	32
29	30
30	37
31	32
32	63
33	36
34	36
35	40
36	53
37	38
38	40
39	42
40	49
41	42
42	48
43	44
44	48
45	56
46	48
47	48
48	71
49	57
50	62
51	54
52	56
53	54
54	80
55	60
56	65
57	60
58	60
59	60
60	74
61	62
62	64
63	73
64	127
65	70
66	72
67	68
68	72
69	72
70	81
71	72
72	107