A262999 - cp's OEIS frontend

A262999 Number of ordered pairs (k, m) with k > 0 and m > 0 such that n = pi(k*(k+1)/2) + pi(m^2), where pi(x) denotes the number of primes not exceeding x.

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

[0, 2, 1, 3, 1, 4, 1, 4, 3, 3, 4, 3, 4, 3, 5, 2, 4, 6, 2, 6, 3, 5, 3, 5, 5, 4, 6, 3, 5, 5, 4, 5, 6, 6, 1, 10, 1, 6, 7, 3, 6, 6, 6, 3, 6, 6, 4, 9, 2, 8, 4, 7, 3, 8, 5, 4, 8, 6, 2, 7, 6, 6, 4, 8, 5, 7, 3, 7, 7, 6, 4, 10, 3, 5, 8, 8, 4, 6, 4, 10, 7, 3, 5, 9, 6, 5, 5, 9, 4, 8]

cp's OEIS Frontend

A262999 Number of ordered pairs (k, m) with k > 0 and m > 0 such that n = pi(k*(k+1)/2) + pi(m^2), where pi(x) denotes the number of primes not exceeding x.

Table of values

List of values

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

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

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