A039767 - cp's OEIS frontend

A039767 Numbers k such that gcd(phi(k), k-1) = number of distinct prime factors of (k-1).

n	a(n)
1	4
2	6
3	8
4	10
5	12
6	14
7	15
8	18
9	20
10	24
11	26
12	27
13	30
14	32
15	35
16	38
17	39
18	42
19	44
20	48
21	50
22	51
23	54
24	55
25	60
26	62
27	63
28	68
29	72
30	74
31	75
32	80
33	81
34	82
35	84
36	87
37	90
38	95
39	98
40	99
41	102
42	104
43	108
44	110
45	114
46	119
47	122
48	123
49	126
50	128
51	132
52	135
53	138
54	140
55	143
56	147
57	150
58	152
59	158
60	159
61	164
62	168

[4, 6, 8, 10, 12, 14, 15, 18, 20, 24, 26, 27, 30, 32, 35, 38, 39, 42, 44, 48, 50, 51, 54, 55, 60, 62, 63, 68, 72, 74, 75, 80, 81, 82, 84, 87, 90, 95, 98, 99, 102, 104, 108, 110, 114, 119, 122, 123, 126, 128, 132, 135, 138, 140, 143, 147, 150, 152, 158, 159, 164, 168]

cp's OEIS Frontend

A039767 Numbers k such that gcd(phi(k), k-1) = number of distinct prime factors of (k-1).

Table of values

List of values

n	a(n)
1	4
2	6
3	8
4	10
5	12
6	14
7	15
8	18
9	20
10	24
11	26
12	27
13	30
14	32
15	35
16	38
17	39
18	42
19	44
20	48
21	50
22	51
23	54
24	55
25	60
26	62
27	63
28	68
29	72
30	74
31	75
32	80
33	81
34	82
35	84
36	87
37	90
38	95
39	98
40	99
41	102
42	104
43	108
44	110
45	114
46	119
47	122
48	123
49	126
50	128
51	132
52	135
53	138
54	140
55	143
56	147
57	150
58	152
59	158
60	159
61	164
62	168

n	a(n)
1	4
2	6
3	8
4	10
5	12
6	14
7	15
8	18
9	20
10	24
11	26
12	27
13	30
14	32
15	35
16	38
17	39
18	42
19	44
20	48
21	50
22	51
23	54
24	55
25	60
26	62
27	63
28	68
29	72
30	74
31	75
32	80
33	81
34	82
35	84
36	87
37	90
38	95
39	98
40	99
41	102
42	104
43	108
44	110
45	114
46	119
47	122
48	123
49	126
50	128
51	132
52	135
53	138
54	140
55	143
56	147
57	150
58	152
59	158
60	159
61	164
62	168

n	a(n)
1	4
2	6
3	8
4	10
5	12
6	14
7	15
8	18
9	20
10	24
11	26
12	27
13	30
14	32
15	35
16	38
17	39
18	42
19	44
20	48
21	50
22	51
23	54
24	55
25	60
26	62
27	63
28	68
29	72
30	74
31	75
32	80
33	81
34	82
35	84
36	87
37	90
38	95
39	98
40	99
41	102
42	104
43	108
44	110
45	114
46	119
47	122
48	123
49	126
50	128
51	132
52	135
53	138
54	140
55	143
56	147
57	150
58	152
59	158
60	159
61	164
62	168