A237710 - cp's OEIS frontend

A237710 Least prime p < n with pi(n-p) a square, or 0 if such a prime p does not exist.

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

[0, 0, 2, 2, 3, 5, 5, 7, 2, 2, 2, 2, 3, 5, 5, 7, 7, 11, 11, 11, 11, 13, 13, 17, 2, 2, 2, 2, 2, 2, 3, 5, 5, 7, 7, 11, 11, 11, 11, 13, 13, 17, 17, 17, 17, 19, 19, 23, 23, 23, 23, 29, 29, 29, 2, 2, 2, 2, 2, 2, 3, 5, 5, 7, 7, 11, 11, 11, 11, 13]

cp's OEIS Frontend

A237710 Least prime p < n with pi(n-p) a square, or 0 if such a prime p does not exist.

Table of values

List of values

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

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

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