A237721 - cp's OEIS frontend

A237721 Number of primes p <= n with floor( sqrt(n-p) ) a square.

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

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

cp's OEIS Frontend

A237721 Number of primes p <= n with floor( sqrt(n-p) ) a square.

Table of values

List of values

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

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

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