A379945 - cp's OEIS frontend

A379945 Irregular triangle read by rows: T(n, k) is the numerator of the harmonic mean of all positive divisors of n except the k-th of them.

n	a(n)
2	2
3	1
4	3
5	1
6	8
7	8
8	4
9	5
10	1
11	3
12	2
13	9
14	18
15	7
16	1
17	24
18	24
19	24
20	12
21	9
22	9
23	3
24	15
25	30
26	15
27	30
28	11
29	1
30	15
31	30
32	5
33	12
34	30
35	20
36	13
37	1
38	21
39	42
40	21
41	42
42	5
43	45
44	15
45	45
46	64
47	64
48	64
49	64
50	32
51	17
52	1
53	30
54	3
55	30
56	5
57	90
58	45
59	19
60	1
61	50
62	25
63	100
64	50
65	5
66	100
67	63
68	63
69	63
70	63
71	33
72	66
73	33
74	66
75	23
76	1

[2, 1, 3, 1, 8, 8, 4, 5, 1, 3, 2, 9, 18, 7, 1, 24, 24, 24, 12, 9, 9, 3, 15, 30, 15, 30, 11, 1, 15, 30, 5, 12, 30, 20, 13, 1, 21, 42, 21, 42, 5, 45, 15, 45, 64, 64, 64, 64, 32, 17, 1, 30, 3, 30, 5, 90, 45, 19, 1, 50, 25, 100, 50, 5, 100, 63, 63, 63, 63, 33, 66, 33, 66, 23, 1]

cp's OEIS Frontend

A379945 Irregular triangle read by rows: T(n, k) is the numerator of the harmonic mean of all positive divisors of n except the k-th of them.

Table of values

List of values

n	a(n)
2	2
3	1
4	3
5	1
6	8
7	8
8	4
9	5
10	1
11	3
12	2
13	9
14	18
15	7
16	1
17	24
18	24
19	24
20	12
21	9
22	9
23	3
24	15
25	30
26	15
27	30
28	11
29	1
30	15
31	30
32	5
33	12
34	30
35	20
36	13
37	1
38	21
39	42
40	21
41	42
42	5
43	45
44	15
45	45
46	64
47	64
48	64
49	64
50	32
51	17
52	1
53	30
54	3
55	30
56	5
57	90
58	45
59	19
60	1
61	50
62	25
63	100
64	50
65	5
66	100
67	63
68	63
69	63
70	63
71	33
72	66
73	33
74	66
75	23
76	1

n	a(n)
2	2
3	1
4	3
5	1
6	8
7	8
8	4
9	5
10	1
11	3
12	2
13	9
14	18
15	7
16	1
17	24
18	24
19	24
20	12
21	9
22	9
23	3
24	15
25	30
26	15
27	30
28	11
29	1
30	15
31	30
32	5
33	12
34	30
35	20
36	13
37	1
38	21
39	42
40	21
41	42
42	5
43	45
44	15
45	45
46	64
47	64
48	64
49	64
50	32
51	17
52	1
53	30
54	3
55	30
56	5
57	90
58	45
59	19
60	1
61	50
62	25
63	100
64	50
65	5
66	100
67	63
68	63
69	63
70	63
71	33
72	66
73	33
74	66
75	23
76	1

n	a(n)
2	2
3	1
4	3
5	1
6	8
7	8
8	4
9	5
10	1
11	3
12	2
13	9
14	18
15	7
16	1
17	24
18	24
19	24
20	12
21	9
22	9
23	3
24	15
25	30
26	15
27	30
28	11
29	1
30	15
31	30
32	5
33	12
34	30
35	20
36	13
37	1
38	21
39	42
40	21
41	42
42	5
43	45
44	15
45	45
46	64
47	64
48	64
49	64
50	32
51	17
52	1
53	30
54	3
55	30
56	5
57	90
58	45
59	19
60	1
61	50
62	25
63	100
64	50
65	5
66	100
67	63
68	63
69	63
70	63
71	33
72	66
73	33
74	66
75	23
76	1