A238402 - cp's OEIS frontend

A238402 Number of ways to write n = p^2 + q - pi(q) with p prime and q among 1, ..., n, where pi(.) is given by A000720.

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

[0, 0, 0, 0, 3, 2, 2, 1, 1, 4, 2, 2, 1, 1, 2, 2, 1, 1, 2, 2, 1, 1, 2, 1, 1, 4, 3, 3, 1, 1, 2, 2, 1, 1, 2, 2, 1, 1, 2, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 5, 3, 3, 3, 3, 3, 3, 3, 2, 3, 3, 2, 3, 3, 2, 2, 2, 3, 4, 3, 2, 2, 2, 3, 3, 2, 3, 4, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 2, 3, 3, 3, 2, 2, 2, 2, 4, 2, 2, 3]

cp's OEIS Frontend

A238402 Number of ways to write n = p^2 + q - pi(q) with p prime and q among 1, ..., n, where pi(.) is given by A000720.

Table of values

List of values

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

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

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