A355875 - cp's OEIS frontend

A355875 For n >= 1, k >= 1; a(n) = Sum_{k=1..n} f(n,k). f(n,k) = nk/(n + k) if nk divides (n+k), 0 otherwise.

n	a(n)
1	0
2	1
3	0
4	2
5	0
6	5
7	0
8	4
9	0
10	5
11	0
12	13
13	0
14	7
15	6
16	8
17	0
18	15
19	0
20	14
21	0
22	11
23	0
24	26
25	0
26	13
27	0
28	26
29	0
30	42
31	0
32	16
33	0
34	17
35	10
36	39
37	0
38	19
39	0
40	43
41	0
42	41
43	0
44	22
45	38
46	23
47	0
48	52
49	0
50	25
51	0
52	26
53	0
54	45
55	0
56	59
57	0
58	29
59	0
60	111
61	0
62	31
63	14
64	32
65	0
66	85
67	0
68	34
69	0
70	76
71	0
72	86
73	0
74	37
75	30
76	38

[0, 1, 0, 2, 0, 5, 0, 4, 0, 5, 0, 13, 0, 7, 6, 8, 0, 15, 0, 14, 0, 11, 0, 26, 0, 13, 0, 26, 0, 42, 0, 16, 0, 17, 10, 39, 0, 19, 0, 43, 0, 41, 0, 22, 38, 23, 0, 52, 0, 25, 0, 26, 0, 45, 0, 59, 0, 29, 0, 111, 0, 31, 14, 32, 0, 85, 0, 34, 0, 76, 0, 86, 0, 37, 30, 38]

cp's OEIS Frontend

A355875 For n >= 1, k >= 1; a(n) = Sum_{k=1..n} f(n,k). f(n,k) = nk/(n + k) if nk divides (n+k), 0 otherwise.

Table of values

List of values

n	a(n)
1	0
2	1
3	0
4	2
5	0
6	5
7	0
8	4
9	0
10	5
11	0
12	13
13	0
14	7
15	6
16	8
17	0
18	15
19	0
20	14
21	0
22	11
23	0
24	26
25	0
26	13
27	0
28	26
29	0
30	42
31	0
32	16
33	0
34	17
35	10
36	39
37	0
38	19
39	0
40	43
41	0
42	41
43	0
44	22
45	38
46	23
47	0
48	52
49	0
50	25
51	0
52	26
53	0
54	45
55	0
56	59
57	0
58	29
59	0
60	111
61	0
62	31
63	14
64	32
65	0
66	85
67	0
68	34
69	0
70	76
71	0
72	86
73	0
74	37
75	30
76	38

n	a(n)
1	0
2	1
3	0
4	2
5	0
6	5
7	0
8	4
9	0
10	5
11	0
12	13
13	0
14	7
15	6
16	8
17	0
18	15
19	0
20	14
21	0
22	11
23	0
24	26
25	0
26	13
27	0
28	26
29	0
30	42
31	0
32	16
33	0
34	17
35	10
36	39
37	0
38	19
39	0
40	43
41	0
42	41
43	0
44	22
45	38
46	23
47	0
48	52
49	0
50	25
51	0
52	26
53	0
54	45
55	0
56	59
57	0
58	29
59	0
60	111
61	0
62	31
63	14
64	32
65	0
66	85
67	0
68	34
69	0
70	76
71	0
72	86
73	0
74	37
75	30
76	38

cp's OEIS Frontend

A355875 For n >= 1, k >= 1; a(n) = Sum_{k=1..n} f(n,k). f(n,k) = n*k/(n + k) if n*k divides (n+k), 0 otherwise.

Table of values

List of values

A355875 For n >= 1, k >= 1; a(n) = Sum_{k=1..n} f(n,k). f(n,k) = nk/(n + k) if nk divides (n+k), 0 otherwise.

n	a(n)
1	0
2	1
3	0
4	2
5	0
6	5
7	0
8	4
9	0
10	5
11	0
12	13
13	0
14	7
15	6
16	8
17	0
18	15
19	0
20	14
21	0
22	11
23	0
24	26
25	0
26	13
27	0
28	26
29	0
30	42
31	0
32	16
33	0
34	17
35	10
36	39
37	0
38	19
39	0
40	43
41	0
42	41
43	0
44	22
45	38
46	23
47	0
48	52
49	0
50	25
51	0
52	26
53	0
54	45
55	0
56	59
57	0
58	29
59	0
60	111
61	0
62	31
63	14
64	32
65	0
66	85
67	0
68	34
69	0
70	76
71	0
72	86
73	0
74	37
75	30
76	38