A263978 - cp's OEIS frontend

A263978 Least prime p such that n^2 + p^2 is prime, or 0 if none.

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

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

cp's OEIS Frontend

A263978 Least prime p such that n^2 + p^2 is prime, or 0 if none.

Table of values

List of values

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

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

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