A109423 - cp's OEIS frontend

A109423 Numbers n such that sigma(n)/bigomega(n) is an integer [sigma(n) = sum of divisors of n; bigomega(n) = number of prime divisors of n, counted with multiplicity].

n	a(n)
1	2
2	3
3	5
4	6
5	7
6	8
7	10
8	11
9	13
10	14
11	15
12	17
13	18
14	19
15	20
16	21
17	22
18	23
19	24
20	26
21	29
22	30
23	31
24	33
25	34
26	35
27	37
28	38
29	39
30	41
31	42
32	43
33	44
34	45
35	46
36	47
37	50
38	51
39	53
40	54
41	55
42	56
43	57
44	58
45	59
46	60
47	61
48	62
49	65
50	66
51	67
52	68
53	69
54	70
55	71
56	72
57	73
58	74
59	77
60	78
61	79
62	82
63	83
64	84
65	85
66	86
67	87
68	88
69	89
70	91
71	92

[2, 3, 5, 6, 7, 8, 10, 11, 13, 14, 15, 17, 18, 19, 20, 21, 22, 23, 24, 26, 29, 30, 31, 33, 34, 35, 37, 38, 39, 41, 42, 43, 44, 45, 46, 47, 50, 51, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 77, 78, 79, 82, 83, 84, 85, 86, 87, 88, 89, 91, 92]

cp's OEIS Frontend

A109423 Numbers n such that sigma(n)/bigomega(n) is an integer [sigma(n) = sum of divisors of n; bigomega(n) = number of prime divisors of n, counted with multiplicity].

Table of values

List of values

n	a(n)
1	2
2	3
3	5
4	6
5	7
6	8
7	10
8	11
9	13
10	14
11	15
12	17
13	18
14	19
15	20
16	21
17	22
18	23
19	24
20	26
21	29
22	30
23	31
24	33
25	34
26	35
27	37
28	38
29	39
30	41
31	42
32	43
33	44
34	45
35	46
36	47
37	50
38	51
39	53
40	54
41	55
42	56
43	57
44	58
45	59
46	60
47	61
48	62
49	65
50	66
51	67
52	68
53	69
54	70
55	71
56	72
57	73
58	74
59	77
60	78
61	79
62	82
63	83
64	84
65	85
66	86
67	87
68	88
69	89
70	91
71	92

n	a(n)
1	2
2	3
3	5
4	6
5	7
6	8
7	10
8	11
9	13
10	14
11	15
12	17
13	18
14	19
15	20
16	21
17	22
18	23
19	24
20	26
21	29
22	30
23	31
24	33
25	34
26	35
27	37
28	38
29	39
30	41
31	42
32	43
33	44
34	45
35	46
36	47
37	50
38	51
39	53
40	54
41	55
42	56
43	57
44	58
45	59
46	60
47	61
48	62
49	65
50	66
51	67
52	68
53	69
54	70
55	71
56	72
57	73
58	74
59	77
60	78
61	79
62	82
63	83
64	84
65	85
66	86
67	87
68	88
69	89
70	91
71	92

n	a(n)
1	2
2	3
3	5
4	6
5	7
6	8
7	10
8	11
9	13
10	14
11	15
12	17
13	18
14	19
15	20
16	21
17	22
18	23
19	24
20	26
21	29
22	30
23	31
24	33
25	34
26	35
27	37
28	38
29	39
30	41
31	42
32	43
33	44
34	45
35	46
36	47
37	50
38	51
39	53
40	54
41	55
42	56
43	57
44	58
45	59
46	60
47	61
48	62
49	65
50	66
51	67
52	68
53	69
54	70
55	71
56	72
57	73
58	74
59	77
60	78
61	79
62	82
63	83
64	84
65	85
66	86
67	87
68	88
69	89
70	91
71	92