A263001 - cp's OEIS frontend

A263001 Number of ordered pairs (k, m) with k > 0 and m > 0 such that n = pi(k(k+1)) + pi(m(m+1)/2), where pi(x) denotes the number of primes not exceeding x.

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

[1, 0, 2, 1, 3, 1, 3, 2, 3, 3, 3, 4, 3, 4, 2, 5, 4, 2, 7, 2, 4, 5, 2, 7, 2, 5, 4, 4, 5, 3, 5, 6, 4, 5, 6, 3, 6, 6, 2, 9, 3, 5, 5, 5, 6, 5, 6, 5, 4, 7, 4, 7, 4, 5, 6, 7, 3, 5, 6, 7, 4, 7, 7, 5, 3, 9, 5, 7, 3, 8, 7, 5, 4, 8, 6, 6, 3, 10, 7, 3, 3, 11, 5, 7, 4, 8, 5, 4, 7, 7, 5, 8, 3, 8, 7, 4, 5, 9, 6, 9]

cp's OEIS Frontend

A263001 Number of ordered pairs (k, m) with k > 0 and m > 0 such that n = pi(k(k+1)) + pi(m(m+1)/2), where pi(x) denotes the number of primes not exceeding x.

Table of values

List of values

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

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

cp's OEIS Frontend

A263001 Number of ordered pairs (k, m) with k > 0 and m > 0 such that n = pi(k*(k+1)) + pi(m*(m+1)/2), where pi(x) denotes the number of primes not exceeding x.

Table of values

List of values

A263001 Number of ordered pairs (k, m) with k > 0 and m > 0 such that n = pi(k(k+1)) + pi(m(m+1)/2), where pi(x) denotes the number of primes not exceeding x.

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