A256503 - cp's OEIS frontend

A256503 Smallest k>=1 such that n^2 + (n+1)^2 + ... + (n+k)^2 is prime or a(n)=0 if there is no such k.

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

[1, 1, 5, 1, 1, 2, 1, 0, 1, 0, 0, 1, 5, 1, 0, 0, 1, 5, 1, 0, 5, 1, 5, 1, 1, 0, 0, 0, 1, 1, 0, 1, 0, 1, 1, 0, 0, 5, 1, 0, 0, 1, 0, 0, 0, 0, 1, 5, 0, 1, 5, 2, 0, 0, 0, 2, 0, 0, 0, 1, 0, 2, 5, 0, 1, 2, 0, 0, 1, 1, 0, 1, 0, 0, 0, 2, 0, 0, 1, 0, 5, 1, 0, 1, 1, 2, 1]

cp's OEIS Frontend

A256503 Smallest k>=1 such that n^2 + (n+1)^2 + ... + (n+k)^2 is prime or a(n)=0 if there is no such k.

Table of values

List of values

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

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

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