A255325 - cp's OEIS frontend

A255325 Half of the difference between the n-th Ludic number and the n-th noncomposite: a(n) = (A003309(n) - A008578(n))/2.

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

[0, 0, 0, 0, 0, 0, 0, 0, 2, 1, 0, 3, 2, 1, 2, 3, 4, 4, 5, 5, 6, 8, 6, 7, 9, 9, 9, 9, 10, 11, 15, 11, 13, 12, 17, 13, 14, 12, 15, 21, 19, 21, 21, 18, 20, 19, 20, 18, 17, 19, 24, 25, 24, 30, 28, 28, 33, 31, 33, 32, 36, 38, 34, 35, 36, 38, 40, 38, 39, 36, 36, 39, 37, 35, 36, 42, 42, 43, 42, 46, 44, 42, 44, 43, 47, 48, 49, 52]

cp's OEIS Frontend

A255325 Half of the difference between the n-th Ludic number and the n-th noncomposite: a(n) = (A003309(n) - A008578(n))/2.

Table of values

List of values

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

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

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