A377321 - cp's OEIS frontend

A377321 a(n) is the smallest positive integer k such that n + k and n - k have the same number of distinct prime factors.

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

[1, 2, 1, 2, 1, 2, 1, 1, 1, 1, 3, 2, 2, 3, 1, 1, 2, 1, 2, 1, 1, 1, 1, 1, 1, 2, 1, 3, 4, 4, 1, 1, 2, 1, 2, 1, 3, 3, 1, 3, 3, 1, 2, 1, 1, 1, 2, 1, 2, 1, 2, 1, 1, 1, 4, 3, 1, 4, 6, 3, 1, 3, 3, 2, 2, 2, 2, 3, 1, 1, 2, 1, 1, 3, 2, 3, 1, 1, 1, 3, 2, 3, 1, 1, 3, 2, 2]

cp's OEIS Frontend

A377321 a(n) is the smallest positive integer k such that n + k and n - k have the same number of distinct prime factors.

Table of values

List of values

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

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

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