A110176 - cp's OEIS frontend

A110176 Least k such that sigma(n) = sigma(k) + sigma(n-k) for 0 or 0 if there is no such k, where sigma is the sum of divisors function.

n	a(n)
1	0
2	0
3	1
4	0
5	0
6	0
7	0
8	2
9	4
10	2
11	0
12	0
13	0
14	0
15	5
16	0
17	0
18	0
19	0
20	2
21	7
22	0
23	0
24	0
25	0
26	0
27	0
28	0
29	0
30	6
31	0
32	4
33	11
34	0
35	0
36	0
37	0
38	0
39	13
40	10
41	0
42	0
43	0
44	0
45	0
46	0
47	0
48	0
49	8
50	0
51	17
52	0
53	0
54	0
55	12
56	14
57	19
58	0
59	0
60	0
61	0
62	17
63	19
64	0
65	0
66	0
67	0
68	0
69	14
70	14
71	0
72	0
73	0
74	0
75	25
76	0
77	0
78	0
79	0
80	0
81	0
82	0
83	0
84	0
85	38
86	0
87	22
88	22
89	0
90	18
91	0
92	30
93	31
94	19
95	0
96	12

[0, 0, 1, 0, 0, 0, 0, 2, 4, 2, 0, 0, 0, 0, 5, 0, 0, 0, 0, 2, 7, 0, 0, 0, 0, 0, 0, 0, 0, 6, 0, 4, 11, 0, 0, 0, 0, 0, 13, 10, 0, 0, 0, 0, 0, 0, 0, 0, 8, 0, 17, 0, 0, 0, 12, 14, 19, 0, 0, 0, 0, 17, 19, 0, 0, 0, 0, 0, 14, 14, 0, 0, 0, 0, 25, 0, 0, 0, 0, 0, 0, 0, 0, 0, 38, 0, 22, 22, 0, 18, 0, 30, 31, 19, 0, 12]

cp's OEIS Frontend

A110176 Least k such that sigma(n) = sigma(k) + sigma(n-k) for 0 or 0 if there is no such k, where sigma is the sum of divisors function.

Table of values

List of values

n	a(n)
1	0
2	0
3	1
4	0
5	0
6	0
7	0
8	2
9	4
10	2
11	0
12	0
13	0
14	0
15	5
16	0
17	0
18	0
19	0
20	2
21	7
22	0
23	0
24	0
25	0
26	0
27	0
28	0
29	0
30	6
31	0
32	4
33	11
34	0
35	0
36	0
37	0
38	0
39	13
40	10
41	0
42	0
43	0
44	0
45	0
46	0
47	0
48	0
49	8
50	0
51	17
52	0
53	0
54	0
55	12
56	14
57	19
58	0
59	0
60	0
61	0
62	17
63	19
64	0
65	0
66	0
67	0
68	0
69	14
70	14
71	0
72	0
73	0
74	0
75	25
76	0
77	0
78	0
79	0
80	0
81	0
82	0
83	0
84	0
85	38
86	0
87	22
88	22
89	0
90	18
91	0
92	30
93	31
94	19
95	0
96	12

n	a(n)
1	0
2	0
3	1
4	0
5	0
6	0
7	0
8	2
9	4
10	2
11	0
12	0
13	0
14	0
15	5
16	0
17	0
18	0
19	0
20	2
21	7
22	0
23	0
24	0
25	0
26	0
27	0
28	0
29	0
30	6
31	0
32	4
33	11
34	0
35	0
36	0
37	0
38	0
39	13
40	10
41	0
42	0
43	0
44	0
45	0
46	0
47	0
48	0
49	8
50	0
51	17
52	0
53	0
54	0
55	12
56	14
57	19
58	0
59	0
60	0
61	0
62	17
63	19
64	0
65	0
66	0
67	0
68	0
69	14
70	14
71	0
72	0
73	0
74	0
75	25
76	0
77	0
78	0
79	0
80	0
81	0
82	0
83	0
84	0
85	38
86	0
87	22
88	22
89	0
90	18
91	0
92	30
93	31
94	19
95	0
96	12

n	a(n)
1	0
2	0
3	1
4	0
5	0
6	0
7	0
8	2
9	4
10	2
11	0
12	0
13	0
14	0
15	5
16	0
17	0
18	0
19	0
20	2
21	7
22	0
23	0
24	0
25	0
26	0
27	0
28	0
29	0
30	6
31	0
32	4
33	11
34	0
35	0
36	0
37	0
38	0
39	13
40	10
41	0
42	0
43	0
44	0
45	0
46	0
47	0
48	0
49	8
50	0
51	17
52	0
53	0
54	0
55	12
56	14
57	19
58	0
59	0
60	0
61	0
62	17
63	19
64	0
65	0
66	0
67	0
68	0
69	14
70	14
71	0
72	0
73	0
74	0
75	25
76	0
77	0
78	0
79	0
80	0
81	0
82	0
83	0
84	0
85	38
86	0
87	22
88	22
89	0
90	18
91	0
92	30
93	31
94	19
95	0
96	12