A377319 - cp's OEIS frontend

A377319 a(n) is the smallest positive integer k such that n + k and n - k have the same number of divisors.

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

[1, 2, 1, 1, 2, 1, 3, 3, 1, 6, 3, 2, 3, 6, 1, 1, 3, 2, 9, 5, 2, 6, 3, 3, 6, 12, 1, 4, 6, 4, 1, 5, 2, 2, 6, 2, 3, 1, 1, 8, 3, 2, 11, 3, 4, 7, 3, 1, 6, 2, 3, 1, 1, 4, 7, 9, 1, 4, 7, 4, 3, 6, 5, 2, 2, 2, 3, 6, 1, 4, 4, 4, 3, 6, 4, 9, 6, 2, 5, 5, 2, 8, 1, 3, 3, 2, 3]

cp's OEIS Frontend

A377319 a(n) is the smallest positive integer k such that n + k and n - k have the same number of divisors.

Table of values

List of values

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

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

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