A306639 - cp's OEIS frontend

A306639 Numbers m such that Sum_{d|m} (sigma(d)/tau(d)) is an integer h where sigma(k) = the sum of the divisors of k (A000203) and tau(k) = the number of divisors of k (A000005).

n	a(n)
1	1
2	3
3	5
4	7
5	10
6	11
7	13
8	15
9	17
10	19
11	21
12	23
13	26
14	29
15	30
16	31
17	33
18	34
19	35
20	37
21	39
22	41
23	43
24	47
25	49
26	51
27	53
28	55
29	57
30	58
31	59
32	60
33	61
34	65
35	67
36	69
37	70
38	71
39	73
40	74
41	75
42	77
43	78
44	79
45	82
46	83
47	85
48	87
49	89
50	91
51	93
52	95
53	97
54	98
55	101
56	102
57	103
58	105
59	106
60	107
61	109
62	110
63	111
64	113

[1, 3, 5, 7, 10, 11, 13, 15, 17, 19, 21, 23, 26, 29, 30, 31, 33, 34, 35, 37, 39, 41, 43, 47, 49, 51, 53, 55, 57, 58, 59, 60, 61, 65, 67, 69, 70, 71, 73, 74, 75, 77, 78, 79, 82, 83, 85, 87, 89, 91, 93, 95, 97, 98, 101, 102, 103, 105, 106, 107, 109, 110, 111, 113]

cp's OEIS Frontend

A306639 Numbers m such that Sum_{d|m} (sigma(d)/tau(d)) is an integer h where sigma(k) = the sum of the divisors of k (A000203) and tau(k) = the number of divisors of k (A000005).

Table of values

List of values

n	a(n)
1	1
2	3
3	5
4	7
5	10
6	11
7	13
8	15
9	17
10	19
11	21
12	23
13	26
14	29
15	30
16	31
17	33
18	34
19	35
20	37
21	39
22	41
23	43
24	47
25	49
26	51
27	53
28	55
29	57
30	58
31	59
32	60
33	61
34	65
35	67
36	69
37	70
38	71
39	73
40	74
41	75
42	77
43	78
44	79
45	82
46	83
47	85
48	87
49	89
50	91
51	93
52	95
53	97
54	98
55	101
56	102
57	103
58	105
59	106
60	107
61	109
62	110
63	111
64	113

n	a(n)
1	1
2	3
3	5
4	7
5	10
6	11
7	13
8	15
9	17
10	19
11	21
12	23
13	26
14	29
15	30
16	31
17	33
18	34
19	35
20	37
21	39
22	41
23	43
24	47
25	49
26	51
27	53
28	55
29	57
30	58
31	59
32	60
33	61
34	65
35	67
36	69
37	70
38	71
39	73
40	74
41	75
42	77
43	78
44	79
45	82
46	83
47	85
48	87
49	89
50	91
51	93
52	95
53	97
54	98
55	101
56	102
57	103
58	105
59	106
60	107
61	109
62	110
63	111
64	113

n	a(n)
1	1
2	3
3	5
4	7
5	10
6	11
7	13
8	15
9	17
10	19
11	21
12	23
13	26
14	29
15	30
16	31
17	33
18	34
19	35
20	37
21	39
22	41
23	43
24	47
25	49
26	51
27	53
28	55
29	57
30	58
31	59
32	60
33	61
34	65
35	67
36	69
37	70
38	71
39	73
40	74
41	75
42	77
43	78
44	79
45	82
46	83
47	85
48	87
49	89
50	91
51	93
52	95
53	97
54	98
55	101
56	102
57	103
58	105
59	106
60	107
61	109
62	110
63	111
64	113