A375205 - cp's OEIS frontend

A375205 PrimePi(greatest prime < sqrt(Q)) - PrimePi(greatest prime factor(Q) < sqrt(Q)), with Q = A082686(n).

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

[0, 0, 1, 1, 0, 1, 0, 2, 1, 2, 0, 1, 2, 1, 0, 1, 2, 0, 2, 1, 2, 0, 2, 1, 2, 0, 3, 2, 3, 1, 2, 3, 0, 2, 1, 3, 2, 3, 1, 0, 4, 2, 4, 4, 3, 1, 2, 0, 4, 2, 3, 4, 1, 4, 3, 2, 4, 0, 1, 3, 4, 4, 2, 0, 4, 1, 3, 2, 4, 3, 4, 0, 1, 4, 3, 2, 5, 4, 2, 1, 3, 5, 4, 5, 3]

cp's OEIS Frontend

A375205 PrimePi(greatest prime < sqrt(Q)) - PrimePi(greatest prime factor(Q) < sqrt(Q)), with Q = A082686(n).

Table of values

List of values

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

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

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