A152442 - cp's OEIS frontend

A152442 n is included if the largest divisor of n that is coprime to d(n) is a composite, where d(n) is the number of divisors of n.

n	a(n)
1	4
2	15
3	16
4	21
5	25
6	27
7	30
8	33
9	35
10	36
11	39
12	42
13	49
14	50
15	51
16	54
17	55
18	57
19	64
20	65
21	66
22	69
23	70
24	75
25	77
26	78
27	81
28	85
29	87
30	91
31	93
32	95
33	98
34	100
35	102
36	105
37	110
38	111
39	114
40	115
41	119
42	120
43	121
44	123
45	125
46	129
47	130
48	133
49	135
50	138
51	140
52	141
53	143
54	144
55	145
56	147
57	150
58	154
59	155
60	159
61	161

[4, 15, 16, 21, 25, 27, 30, 33, 35, 36, 39, 42, 49, 50, 51, 54, 55, 57, 64, 65, 66, 69, 70, 75, 77, 78, 81, 85, 87, 91, 93, 95, 98, 100, 102, 105, 110, 111, 114, 115, 119, 120, 121, 123, 125, 129, 130, 133, 135, 138, 140, 141, 143, 144, 145, 147, 150, 154, 155, 159, 161]

cp's OEIS Frontend

A152442 n is included if the largest divisor of n that is coprime to d(n) is a composite, where d(n) is the number of divisors of n.

Table of values

List of values

n	a(n)
1	4
2	15
3	16
4	21
5	25
6	27
7	30
8	33
9	35
10	36
11	39
12	42
13	49
14	50
15	51
16	54
17	55
18	57
19	64
20	65
21	66
22	69
23	70
24	75
25	77
26	78
27	81
28	85
29	87
30	91
31	93
32	95
33	98
34	100
35	102
36	105
37	110
38	111
39	114
40	115
41	119
42	120
43	121
44	123
45	125
46	129
47	130
48	133
49	135
50	138
51	140
52	141
53	143
54	144
55	145
56	147
57	150
58	154
59	155
60	159
61	161

n	a(n)
1	4
2	15
3	16
4	21
5	25
6	27
7	30
8	33
9	35
10	36
11	39
12	42
13	49
14	50
15	51
16	54
17	55
18	57
19	64
20	65
21	66
22	69
23	70
24	75
25	77
26	78
27	81
28	85
29	87
30	91
31	93
32	95
33	98
34	100
35	102
36	105
37	110
38	111
39	114
40	115
41	119
42	120
43	121
44	123
45	125
46	129
47	130
48	133
49	135
50	138
51	140
52	141
53	143
54	144
55	145
56	147
57	150
58	154
59	155
60	159
61	161

n	a(n)
1	4
2	15
3	16
4	21
5	25
6	27
7	30
8	33
9	35
10	36
11	39
12	42
13	49
14	50
15	51
16	54
17	55
18	57
19	64
20	65
21	66
22	69
23	70
24	75
25	77
26	78
27	81
28	85
29	87
30	91
31	93
32	95
33	98
34	100
35	102
36	105
37	110
38	111
39	114
40	115
41	119
42	120
43	121
44	123
45	125
46	129
47	130
48	133
49	135
50	138
51	140
52	141
53	143
54	144
55	145
56	147
57	150
58	154
59	155
60	159
61	161