A209211 - cp's OEIS frontend

A209211 Numbers n such that n-1 and phi(n) are relatively prime.

n	a(n)
1	1
2	2
3	4
4	6
5	8
6	10
7	12
8	14
9	16
10	18
11	20
12	22
13	24
14	26
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	82
38	84
39	86
40	88
41	90
42	92
43	94
44	96
45	98
46	100
47	102
48	104
49	106
50	108
51	110
52	114
53	116
54	118
55	120
56	122
57	126
58	128
59	132
60	134
61	136
62	138

[1, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 54, 56, 58, 60, 62, 64, 68, 72, 74, 78, 80, 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]

cp's OEIS Frontend

A209211 Numbers n such that n-1 and phi(n) are relatively prime.

Table of values

List of values

n	a(n)
1	1
2	2
3	4
4	6
5	8
6	10
7	12
8	14
9	16
10	18
11	20
12	22
13	24
14	26
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	82
38	84
39	86
40	88
41	90
42	92
43	94
44	96
45	98
46	100
47	102
48	104
49	106
50	108
51	110
52	114
53	116
54	118
55	120
56	122
57	126
58	128
59	132
60	134
61	136
62	138

n	a(n)
1	1
2	2
3	4
4	6
5	8
6	10
7	12
8	14
9	16
10	18
11	20
12	22
13	24
14	26
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	82
38	84
39	86
40	88
41	90
42	92
43	94
44	96
45	98
46	100
47	102
48	104
49	106
50	108
51	110
52	114
53	116
54	118
55	120
56	122
57	126
58	128
59	132
60	134
61	136
62	138

n	a(n)
1	1
2	2
3	4
4	6
5	8
6	10
7	12
8	14
9	16
10	18
11	20
12	22
13	24
14	26
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	82
38	84
39	86
40	88
41	90
42	92
43	94
44	96
45	98
46	100
47	102
48	104
49	106
50	108
51	110
52	114
53	116
54	118
55	120
56	122
57	126
58	128
59	132
60	134
61	136
62	138