A354597 - cp's OEIS frontend

A354597 a(n) is the smallest number k>0 such that -n is not a quadratic residue modulo k.

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

[3, 4, 5, 3, 4, 4, 3, 5, 4, 3, 7, 5, 3, 4, 7, 3, 4, 4, 3, 11, 4, 3, 5, 9, 3, 4, 5, 3, 4, 4, 3, 5, 4, 3, 8, 7, 3, 4, 7, 3, 4, 4, 3, 7, 4, 3, 5, 5, 3, 4, 7, 3, 4, 4, 3, 11, 4, 3, 8, 7, 3, 4, 5, 3, 4, 4, 3, 5, 4, 3, 7, 5, 3, 4, 8, 3, 4, 4, 3, 11, 4, 3, 5, 9, 3, 4, 5, 3, 4, 4, 3, 5, 4, 3, 7, 9, 3, 4, 7, 3]

cp's OEIS Frontend

A354597 a(n) is the smallest number k>0 such that -n is not a quadratic residue modulo k.

Table of values

List of values

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

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

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