A020491 - cp's OEIS frontend

A020491 Numbers k such that sigma_0(k) divides phi(k).

n	a(n)
1	1
2	3
3	5
4	7
5	8
6	9
7	10
8	11
9	13
10	15
11	17
12	18
13	19
14	21
15	23
16	24
17	26
18	28
19	29
20	30
21	31
22	33
23	34
24	35
25	37
26	39
27	40
28	41
29	43
30	45
31	47
32	49
33	51
34	52
35	53
36	55
37	56
38	57
39	58
40	59
41	61
42	63
43	65
44	67
45	69
46	70
47	71
48	72
49	73
50	74
51	76
52	77
53	78
54	79
55	82
56	83
57	84
58	85
59	87
60	88
61	89
62	90
63	91
64	93
65	95
66	97
67	98
68	99
69	101
70	102
71	103
72	104

[1, 3, 5, 7, 8, 9, 10, 11, 13, 15, 17, 18, 19, 21, 23, 24, 26, 28, 29, 30, 31, 33, 34, 35, 37, 39, 40, 41, 43, 45, 47, 49, 51, 52, 53, 55, 56, 57, 58, 59, 61, 63, 65, 67, 69, 70, 71, 72, 73, 74, 76, 77, 78, 79, 82, 83, 84, 85, 87, 88, 89, 90, 91, 93, 95, 97, 98, 99, 101, 102, 103, 104]

cp's OEIS Frontend

A020491 Numbers k such that sigma_0(k) divides phi(k).

Table of values

List of values

n	a(n)
1	1
2	3
3	5
4	7
5	8
6	9
7	10
8	11
9	13
10	15
11	17
12	18
13	19
14	21
15	23
16	24
17	26
18	28
19	29
20	30
21	31
22	33
23	34
24	35
25	37
26	39
27	40
28	41
29	43
30	45
31	47
32	49
33	51
34	52
35	53
36	55
37	56
38	57
39	58
40	59
41	61
42	63
43	65
44	67
45	69
46	70
47	71
48	72
49	73
50	74
51	76
52	77
53	78
54	79
55	82
56	83
57	84
58	85
59	87
60	88
61	89
62	90
63	91
64	93
65	95
66	97
67	98
68	99
69	101
70	102
71	103
72	104

n	a(n)
1	1
2	3
3	5
4	7
5	8
6	9
7	10
8	11
9	13
10	15
11	17
12	18
13	19
14	21
15	23
16	24
17	26
18	28
19	29
20	30
21	31
22	33
23	34
24	35
25	37
26	39
27	40
28	41
29	43
30	45
31	47
32	49
33	51
34	52
35	53
36	55
37	56
38	57
39	58
40	59
41	61
42	63
43	65
44	67
45	69
46	70
47	71
48	72
49	73
50	74
51	76
52	77
53	78
54	79
55	82
56	83
57	84
58	85
59	87
60	88
61	89
62	90
63	91
64	93
65	95
66	97
67	98
68	99
69	101
70	102
71	103
72	104

n	a(n)
1	1
2	3
3	5
4	7
5	8
6	9
7	10
8	11
9	13
10	15
11	17
12	18
13	19
14	21
15	23
16	24
17	26
18	28
19	29
20	30
21	31
22	33
23	34
24	35
25	37
26	39
27	40
28	41
29	43
30	45
31	47
32	49
33	51
34	52
35	53
36	55
37	56
38	57
39	58
40	59
41	61
42	63
43	65
44	67
45	69
46	70
47	71
48	72
49	73
50	74
51	76
52	77
53	78
54	79
55	82
56	83
57	84
58	85
59	87
60	88
61	89
62	90
63	91
64	93
65	95
66	97
67	98
68	99
69	101
70	102
71	103
72	104