A292598 - cp's OEIS frontend

A292598 a(n) is the number of odd primes in the sequence [n, floor(n/2), floor(n/4), ..., 1].

n	a(n)
1	0
2	0
3	1
4	0
5	1
6	1
7	2
8	0
9	0
10	1
11	2
12	1
13	2
14	2
15	2
16	0
17	1
18	0
19	1
20	1
21	1
22	2
23	3
24	1
25	1
26	2
27	2
28	2
29	3
30	2
31	3
32	0
33	0
34	1
35	1
36	0
37	1
38	1
39	1
40	1
41	2
42	1
43	2
44	2
45	2
46	3
47	4
48	1
49	1
50	1
51	1
52	2
53	3
54	2
55	2
56	2
57	2
58	3
59	4
60	2
61	3
62	3
63	3
64	0
65	0
66	0
67	1
68	1
69	1
70	1
71	2
72	0
73	1
74	1
75	1
76	1
77	1
78	1
79	2
80	1
81	1
82	2
83	3
84	1
85	1
86	2
87	2
88	2
89	3
90	2
91	2
92	3
93	3
94	4
95	4
96	1
97	2
98	1
99	1
100	1
101	2
102	1
103	2
104	2
105	2

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

cp's OEIS Frontend

A292598 a(n) is the number of odd primes in the sequence [n, floor(n/2), floor(n/4), ..., 1].

Table of values

List of values

n	a(n)
1	0
2	0
3	1
4	0
5	1
6	1
7	2
8	0
9	0
10	1
11	2
12	1
13	2
14	2
15	2
16	0
17	1
18	0
19	1
20	1
21	1
22	2
23	3
24	1
25	1
26	2
27	2
28	2
29	3
30	2
31	3
32	0
33	0
34	1
35	1
36	0
37	1
38	1
39	1
40	1
41	2
42	1
43	2
44	2
45	2
46	3
47	4
48	1
49	1
50	1
51	1
52	2
53	3
54	2
55	2
56	2
57	2
58	3
59	4
60	2
61	3
62	3
63	3
64	0
65	0
66	0
67	1
68	1
69	1
70	1
71	2
72	0
73	1
74	1
75	1
76	1
77	1
78	1
79	2
80	1
81	1
82	2
83	3
84	1
85	1
86	2
87	2
88	2
89	3
90	2
91	2
92	3
93	3
94	4
95	4
96	1
97	2
98	1
99	1
100	1
101	2
102	1
103	2
104	2
105	2

n	a(n)
1	0
2	0
3	1
4	0
5	1
6	1
7	2
8	0
9	0
10	1
11	2
12	1
13	2
14	2
15	2
16	0
17	1
18	0
19	1
20	1
21	1
22	2
23	3
24	1
25	1
26	2
27	2
28	2
29	3
30	2
31	3
32	0
33	0
34	1
35	1
36	0
37	1
38	1
39	1
40	1
41	2
42	1
43	2
44	2
45	2
46	3
47	4
48	1
49	1
50	1
51	1
52	2
53	3
54	2
55	2
56	2
57	2
58	3
59	4
60	2
61	3
62	3
63	3
64	0
65	0
66	0
67	1
68	1
69	1
70	1
71	2
72	0
73	1
74	1
75	1
76	1
77	1
78	1
79	2
80	1
81	1
82	2
83	3
84	1
85	1
86	2
87	2
88	2
89	3
90	2
91	2
92	3
93	3
94	4
95	4
96	1
97	2
98	1
99	1
100	1
101	2
102	1
103	2
104	2
105	2

n	a(n)
1	0
2	0
3	1
4	0
5	1
6	1
7	2
8	0
9	0
10	1
11	2
12	1
13	2
14	2
15	2
16	0
17	1
18	0
19	1
20	1
21	1
22	2
23	3
24	1
25	1
26	2
27	2
28	2
29	3
30	2
31	3
32	0
33	0
34	1
35	1
36	0
37	1
38	1
39	1
40	1
41	2
42	1
43	2
44	2
45	2
46	3
47	4
48	1
49	1
50	1
51	1
52	2
53	3
54	2
55	2
56	2
57	2
58	3
59	4
60	2
61	3
62	3
63	3
64	0
65	0
66	0
67	1
68	1
69	1
70	1
71	2
72	0
73	1
74	1
75	1
76	1
77	1
78	1
79	2
80	1
81	1
82	2
83	3
84	1
85	1
86	2
87	2
88	2
89	3
90	2
91	2
92	3
93	3
94	4
95	4
96	1
97	2
98	1
99	1
100	1
101	2
102	1
103	2
104	2
105	2