A378898 - cp's OEIS frontend

A378898 a(n) is the least k > 0 such that (n+k)^2 + n^2 is prime.

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

[1, 1, 5, 1, 1, 5, 1, 5, 1, 3, 3, 1, 7, 1, 7, 3, 1, 5, 1, 3, 5, 1, 7, 1, 1, 5, 5, 5, 1, 1, 13, 1, 7, 1, 1, 13, 3, 7, 1, 3, 3, 1, 5, 5, 7, 3, 1, 5, 25, 1, 5, 5, 5, 5, 3, 5, 11, 5, 5, 1, 3, 3, 17, 7, 1, 5, 13, 27, 1, 1, 13, 1, 27, 5, 19, 9, 3, 5, 1, 9, 19, 1, 5, 1, 1, 9, 1, 15, 7, 1, 3, 3, 5, 5, 7]

cp's OEIS Frontend

A378898 a(n) is the least k > 0 such that (n+k)^2 + n^2 is prime.

Table of values

List of values

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

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

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