A249857 - cp's OEIS frontend

A249857 Let z = A084937: a(n) = number of even numbers <= z(n) that are != z(k) for k=1..n-1 and not coprime to z(n-1) and z(n-2).

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

[0, 0, 0, 1, 0, 1, 2, 1, 2, 3, 0, 4, 5, 0, 5, 6, 2, 2, 8, 1, 5, 6, 3, 7, 9, 0, 9, 11, 0, 11, 13, 0, 5, 13, 1, 10, 14, 1, 6, 14, 2, 11, 15, 4, 15, 16, 2, 16, 12, 5, 16, 17, 3, 17, 18, 0, 19, 20, 0, 21, 24, 0, 21, 24, 1, 15, 26, 3, 17, 24, 4, 19, 26, 2, 21, 26]

cp's OEIS Frontend

A249857 Let z = A084937: a(n) = number of even numbers <= z(n) that are != z(k) for k=1..n-1 and not coprime to z(n-1) and z(n-2).

Table of values

List of values

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

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

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