A185636 - cp's OEIS frontend

A185636 a(n) = |{0 <= k < n: n+k and n+k^2 are both prime}|.

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

[0, 2, 2, 2, 1, 2, 3, 1, 2, 3, 2, 3, 3, 1, 4, 2, 2, 3, 2, 2, 2, 5, 3, 3, 5, 2, 5, 6, 3, 4, 3, 3, 4, 4, 3, 5, 9, 3, 6, 5, 2, 6, 5, 3, 5, 3, 4, 5, 3, 4, 3, 4, 4, 4, 7, 3, 9, 14, 2, 8, 2, 4, 8, 6, 4, 3, 8, 2, 5, 9, 4, 7, 5, 2, 6, 4, 6, 12, 6, 4, 4, 7, 4, 8, 8, 3, 6, 8, 4, 8, 8, 5, 11, 4, 6, 5, 11, 7, 12, 10]

cp's OEIS Frontend

A185636 a(n) = |{0 <= k < n: n+k and n+k^2 are both prime}|.

Table of values

List of values

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

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

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