A249777 - cp's OEIS frontend

A249777 Let z = A084937: a(n) = number of 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	5
13	6
14	0
15	6
16	7
17	3
18	2
19	10
20	1
21	5
22	6
23	3
24	7
25	10
26	0
27	10
28	13
29	0
30	13
31	16
32	0
33	5
34	15
35	1
36	11
37	16
38	1
39	6
40	15
41	2
42	11
43	16
44	4
45	16
46	17
47	2
48	17
49	12
50	5
51	16
52	17
53	3
54	17
55	18
56	0
57	20
58	21
59	0
60	23
61	28
62	0
63	23
64	27
65	1
66	15
67	30
68	3
69	17
70	26
71	4
72	19
73	28
74	2
75	21

[0, 0, 0, 1, 0, 1, 2, 1, 2, 3, 0, 5, 6, 0, 6, 7, 3, 2, 10, 1, 5, 6, 3, 7, 10, 0, 10, 13, 0, 13, 16, 0, 5, 15, 1, 11, 16, 1, 6, 15, 2, 11, 16, 4, 16, 17, 2, 17, 12, 5, 16, 17, 3, 17, 18, 0, 20, 21, 0, 23, 28, 0, 23, 27, 1, 15, 30, 3, 17, 26, 4, 19, 28, 2, 21]

cp's OEIS Frontend

A249777 Let z = A084937: a(n) = number of 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	5
13	6
14	0
15	6
16	7
17	3
18	2
19	10
20	1
21	5
22	6
23	3
24	7
25	10
26	0
27	10
28	13
29	0
30	13
31	16
32	0
33	5
34	15
35	1
36	11
37	16
38	1
39	6
40	15
41	2
42	11
43	16
44	4
45	16
46	17
47	2
48	17
49	12
50	5
51	16
52	17
53	3
54	17
55	18
56	0
57	20
58	21
59	0
60	23
61	28
62	0
63	23
64	27
65	1
66	15
67	30
68	3
69	17
70	26
71	4
72	19
73	28
74	2
75	21

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

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