A227180 - cp's OEIS frontend

A227180 Composite numbers n such that b^(n-1) == 1 (mod n) implies b == -1 or +1 (mod n).

n	a(n)
1	4
2	6
3	8
4	9
5	10
6	12
7	14
8	16
9	18
10	20
11	22
12	24
13	26
14	27
15	30
16	32
17	34
18	36
19	38
20	40
21	42
22	44
23	46
24	48
25	50
26	54
27	56
28	58
29	60
30	62
31	64
32	68
33	72
34	74
35	78
36	80
37	81
38	82
39	84
40	86
41	88
42	90
43	92
44	94
45	96
46	98
47	100
48	102
49	104
50	106
51	108
52	110
53	114
54	116
55	118
56	120
57	122
58	126
59	128
60	132
61	134
62	136
63	138
64	140
65	142
66	144
67	146
68	150
69	152
70	156
71	158
72	160
73	162
74	164
75	166
76	168
77	170

[4, 6, 8, 9, 10, 12, 14, 16, 18, 20, 22, 24, 26, 27, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 54, 56, 58, 60, 62, 64, 68, 72, 74, 78, 80, 81, 82, 84, 86, 88, 90, 92, 94, 96, 98, 100, 102, 104, 106, 108, 110, 114, 116, 118, 120, 122, 126, 128, 132, 134, 136, 138, 140, 142, 144, 146, 150, 152, 156, 158, 160, 162, 164, 166, 168, 170]

cp's OEIS Frontend

A227180 Composite numbers n such that b^(n-1) == 1 (mod n) implies b == -1 or +1 (mod n).

Table of values

List of values

n	a(n)
1	4
2	6
3	8
4	9
5	10
6	12
7	14
8	16
9	18
10	20
11	22
12	24
13	26
14	27
15	30
16	32
17	34
18	36
19	38
20	40
21	42
22	44
23	46
24	48
25	50
26	54
27	56
28	58
29	60
30	62
31	64
32	68
33	72
34	74
35	78
36	80
37	81
38	82
39	84
40	86
41	88
42	90
43	92
44	94
45	96
46	98
47	100
48	102
49	104
50	106
51	108
52	110
53	114
54	116
55	118
56	120
57	122
58	126
59	128
60	132
61	134
62	136
63	138
64	140
65	142
66	144
67	146
68	150
69	152
70	156
71	158
72	160
73	162
74	164
75	166
76	168
77	170

n	a(n)
1	4
2	6
3	8
4	9
5	10
6	12
7	14
8	16
9	18
10	20
11	22
12	24
13	26
14	27
15	30
16	32
17	34
18	36
19	38
20	40
21	42
22	44
23	46
24	48
25	50
26	54
27	56
28	58
29	60
30	62
31	64
32	68
33	72
34	74
35	78
36	80
37	81
38	82
39	84
40	86
41	88
42	90
43	92
44	94
45	96
46	98
47	100
48	102
49	104
50	106
51	108
52	110
53	114
54	116
55	118
56	120
57	122
58	126
59	128
60	132
61	134
62	136
63	138
64	140
65	142
66	144
67	146
68	150
69	152
70	156
71	158
72	160
73	162
74	164
75	166
76	168
77	170

n	a(n)
1	4
2	6
3	8
4	9
5	10
6	12
7	14
8	16
9	18
10	20
11	22
12	24
13	26
14	27
15	30
16	32
17	34
18	36
19	38
20	40
21	42
22	44
23	46
24	48
25	50
26	54
27	56
28	58
29	60
30	62
31	64
32	68
33	72
34	74
35	78
36	80
37	81
38	82
39	84
40	86
41	88
42	90
43	92
44	94
45	96
46	98
47	100
48	102
49	104
50	106
51	108
52	110
53	114
54	116
55	118
56	120
57	122
58	126
59	128
60	132
61	134
62	136
63	138
64	140
65	142
66	144
67	146
68	150
69	152
70	156
71	158
72	160
73	162
74	164
75	166
76	168
77	170