A262980 - cp's OEIS frontend

A262980 Number of ordered ways to write n as p + 2^k + pi(2^m), where p is prime, and k and m are nonnegative integers, and pi(x) denotes the number of primes not exceeding x.

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

[0, 0, 1, 3, 4, 5, 6, 7, 7, 8, 8, 7, 9, 7, 12, 7, 10, 7, 12, 9, 14, 11, 12, 10, 15, 8, 13, 6, 12, 7, 12, 9, 13, 9, 14, 11, 15, 11, 18, 9, 14, 8, 14, 10, 18, 13, 11, 9, 18, 13, 17, 10, 13, 7, 15, 12, 14, 10, 10, 10, 15, 12, 19, 11, 15, 12, 16, 10, 20, 12, 13, 12, 20, 12, 23]

cp's OEIS Frontend

A262980 Number of ordered ways to write n as p + 2^k + pi(2^m), where p is prime, and k and m are nonnegative integers, and pi(x) denotes the number of primes not exceeding x.

Table of values

List of values

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

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

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