A300079 - cp's OEIS frontend

A300079 Composite numbers k such that there are exactly phi(phi(k)) residues modulo k of the maximum order.

n	a(n)
1	4
2	6
3	9
4	10
5	14
6	15
7	16
8	18
9	20
10	22
11	25
12	26
13	27
14	30
15	32
16	34
17	35
18	38
19	39
20	40
21	45
22	46
23	48
24	49
25	50
26	51
27	52
28	54
29	55
30	58
31	60
32	62
33	64
34	68
35	70
36	74
37	75
38	78
39	81
40	82
41	85
42	86
43	87
44	90
45	94
46	95
47	96
48	98
49	100
50	102
51	104
52	105
53	106
54	110
55	111
56	112
57	115
58	116
59	118
60	119
61	120
62	121
63	122
64	123
65	125
66	128
67	134
68	135
69	136
70	140
71	142
72	143
73	144
74	146
75	148
76	150
77	153

[4, 6, 9, 10, 14, 15, 16, 18, 20, 22, 25, 26, 27, 30, 32, 34, 35, 38, 39, 40, 45, 46, 48, 49, 50, 51, 52, 54, 55, 58, 60, 62, 64, 68, 70, 74, 75, 78, 81, 82, 85, 86, 87, 90, 94, 95, 96, 98, 100, 102, 104, 105, 106, 110, 111, 112, 115, 116, 118, 119, 120, 121, 122, 123, 125, 128, 134, 135, 136, 140, 142, 143, 144, 146, 148, 150, 153]

cp's OEIS Frontend

A300079 Composite numbers k such that there are exactly phi(phi(k)) residues modulo k of the maximum order.

Table of values

List of values

n	a(n)
1	4
2	6
3	9
4	10
5	14
6	15
7	16
8	18
9	20
10	22
11	25
12	26
13	27
14	30
15	32
16	34
17	35
18	38
19	39
20	40
21	45
22	46
23	48
24	49
25	50
26	51
27	52
28	54
29	55
30	58
31	60
32	62
33	64
34	68
35	70
36	74
37	75
38	78
39	81
40	82
41	85
42	86
43	87
44	90
45	94
46	95
47	96
48	98
49	100
50	102
51	104
52	105
53	106
54	110
55	111
56	112
57	115
58	116
59	118
60	119
61	120
62	121
63	122
64	123
65	125
66	128
67	134
68	135
69	136
70	140
71	142
72	143
73	144
74	146
75	148
76	150
77	153

n	a(n)
1	4
2	6
3	9
4	10
5	14
6	15
7	16
8	18
9	20
10	22
11	25
12	26
13	27
14	30
15	32
16	34
17	35
18	38
19	39
20	40
21	45
22	46
23	48
24	49
25	50
26	51
27	52
28	54
29	55
30	58
31	60
32	62
33	64
34	68
35	70
36	74
37	75
38	78
39	81
40	82
41	85
42	86
43	87
44	90
45	94
46	95
47	96
48	98
49	100
50	102
51	104
52	105
53	106
54	110
55	111
56	112
57	115
58	116
59	118
60	119
61	120
62	121
63	122
64	123
65	125
66	128
67	134
68	135
69	136
70	140
71	142
72	143
73	144
74	146
75	148
76	150
77	153

n	a(n)
1	4
2	6
3	9
4	10
5	14
6	15
7	16
8	18
9	20
10	22
11	25
12	26
13	27
14	30
15	32
16	34
17	35
18	38
19	39
20	40
21	45
22	46
23	48
24	49
25	50
26	51
27	52
28	54
29	55
30	58
31	60
32	62
33	64
34	68
35	70
36	74
37	75
38	78
39	81
40	82
41	85
42	86
43	87
44	90
45	94
46	95
47	96
48	98
49	100
50	102
51	104
52	105
53	106
54	110
55	111
56	112
57	115
58	116
59	118
60	119
61	120
62	121
63	122
64	123
65	125
66	128
67	134
68	135
69	136
70	140
71	142
72	143
73	144
74	146
75	148
76	150
77	153