A069169 - cp's OEIS frontend

A069169 Nonprimes k such that sigma(k)*Sum_{d|k} 1/sigma(d) is an integer.

n	a(n)
1	1
2	6
3	10
4	14
5	15
6	18
7	21
8	22
9	26
10	28
11	30
12	33
13	34
14	35
15	38
16	39
17	40
18	42
19	46
20	51
21	52
22	55
23	57
24	58
25	62
26	65
27	66
28	69
29	70
30	74
31	76
32	77
33	78
34	82
35	84
36	85
37	86
38	87
39	90
40	91
41	93
42	94
43	95
44	102
45	105
46	106
47	110
48	111
49	114
50	115
51	118
52	119
53	120
54	122
55	123
56	124
57	126
58	129
59	130
60	133
61	134
62	138
63	140

[1, 6, 10, 14, 15, 18, 21, 22, 26, 28, 30, 33, 34, 35, 38, 39, 40, 42, 46, 51, 52, 55, 57, 58, 62, 65, 66, 69, 70, 74, 76, 77, 78, 82, 84, 85, 86, 87, 90, 91, 93, 94, 95, 102, 105, 106, 110, 111, 114, 115, 118, 119, 120, 122, 123, 124, 126, 129, 130, 133, 134, 138, 140]

cp's OEIS Frontend

A069169 Nonprimes k such that sigma(k)*Sum_{d|k} 1/sigma(d) is an integer.

Table of values

List of values

n	a(n)
1	1
2	6
3	10
4	14
5	15
6	18
7	21
8	22
9	26
10	28
11	30
12	33
13	34
14	35
15	38
16	39
17	40
18	42
19	46
20	51
21	52
22	55
23	57
24	58
25	62
26	65
27	66
28	69
29	70
30	74
31	76
32	77
33	78
34	82
35	84
36	85
37	86
38	87
39	90
40	91
41	93
42	94
43	95
44	102
45	105
46	106
47	110
48	111
49	114
50	115
51	118
52	119
53	120
54	122
55	123
56	124
57	126
58	129
59	130
60	133
61	134
62	138
63	140

n	a(n)
1	1
2	6
3	10
4	14
5	15
6	18
7	21
8	22
9	26
10	28
11	30
12	33
13	34
14	35
15	38
16	39
17	40
18	42
19	46
20	51
21	52
22	55
23	57
24	58
25	62
26	65
27	66
28	69
29	70
30	74
31	76
32	77
33	78
34	82
35	84
36	85
37	86
38	87
39	90
40	91
41	93
42	94
43	95
44	102
45	105
46	106
47	110
48	111
49	114
50	115
51	118
52	119
53	120
54	122
55	123
56	124
57	126
58	129
59	130
60	133
61	134
62	138
63	140

n	a(n)
1	1
2	6
3	10
4	14
5	15
6	18
7	21
8	22
9	26
10	28
11	30
12	33
13	34
14	35
15	38
16	39
17	40
18	42
19	46
20	51
21	52
22	55
23	57
24	58
25	62
26	65
27	66
28	69
29	70
30	74
31	76
32	77
33	78
34	82
35	84
36	85
37	86
38	87
39	90
40	91
41	93
42	94
43	95
44	102
45	105
46	106
47	110
48	111
49	114
50	115
51	118
52	119
53	120
54	122
55	123
56	124
57	126
58	129
59	130
60	133
61	134
62	138
63	140