A261641 - cp's OEIS frontend

A261641 Number of practical numbers q such that n+(n mod 2)-q and n-(n mod 2)+q are both practical numbers.

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

[1, 0, 1, 1, 2, 1, 2, 1, 2, 3, 2, 3, 3, 2, 1, 3, 3, 3, 3, 4, 3, 4, 4, 6, 4, 2, 2, 4, 3, 5, 4, 5, 4, 4, 5, 8, 5, 2, 3, 5, 3, 6, 4, 7, 4, 2, 5, 11, 6, 1, 4, 7, 3, 7, 4, 7, 5, 4, 6, 11, 4, 2, 3, 8, 5, 8, 3, 9, 5, 2, 5, 13, 6, 2, 2, 7, 3, 9, 4, 9]

cp's OEIS Frontend

A261641 Number of practical numbers q such that n+(n mod 2)-q and n-(n mod 2)+q are both practical numbers.

Table of values

List of values

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

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

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