A263020 - cp's OEIS frontend

A263020 Number of ordered pairs (k, m) with k > 0 and m > 0 such that n = pi(k(k+1)/2) + pi(m(3*m-1)/2), where pi(x) denotes the number of primes not exceeding x.

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

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

cp's OEIS Frontend

A263020 Number of ordered pairs (k, m) with k > 0 and m > 0 such that n = pi(k(k+1)/2) + pi(m(3*m-1)/2), where pi(x) denotes the number of primes not exceeding x.

Table of values

List of values

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

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

cp's OEIS Frontend

A263020 Number of ordered pairs (k, m) with k > 0 and m > 0 such that n = pi(k*(k+1)/2) + pi(m*(3*m-1)/2), where pi(x) denotes the number of primes not exceeding x.

Table of values

List of values

A263020 Number of ordered pairs (k, m) with k > 0 and m > 0 such that n = pi(k(k+1)/2) + pi(m(3*m-1)/2), where pi(x) denotes the number of primes not exceeding x.

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