A225766 - cp's OEIS frontend

A225766 Least k>0 such that k^4+n is prime, or 0 if k^4+n is always composite.

n	a(n)
0	0
1	1
2	1
3	2
4	1
5	6
6	1
7	2
8	3
9	10
10	1
11	6
12	1
13	2
14	165
15	2
16	1
17	12
18	1
19	20
20	3
21	2
22	1
23	6
24	35
25	2
26	3
27	2
28	1
29	90
30	1
31	2
32	3
33	8
34	5
35	12
36	1
37	2
38	9
39	10
40	1
41	60
42	1
43	2
44	75
45	2
46	1
47	18
48	5
49	20
50	3
51	2
52	1
53	12
54	85
55	2
56	3
57	2
58	1
59	30
60	1
61	4
62	21
63	2
64	0
65	6
66	1
67	2
68	3
69	10
70	1
71	6
72	1
73	2
74	255
75	4
76	3
77	6
78	1
79	10
80	27
81	2
82	1
83	72
84	5
85	2
86	3
87	2
88	1
89	570
90	11
91	2
92	3
93	2
94	5
95	18
96	1
97	2
98	3
99	10

[0, 1, 1, 2, 1, 6, 1, 2, 3, 10, 1, 6, 1, 2, 165, 2, 1, 12, 1, 20, 3, 2, 1, 6, 35, 2, 3, 2, 1, 90, 1, 2, 3, 8, 5, 12, 1, 2, 9, 10, 1, 60, 1, 2, 75, 2, 1, 18, 5, 20, 3, 2, 1, 12, 85, 2, 3, 2, 1, 30, 1, 4, 21, 2, 0, 6, 1, 2, 3, 10, 1, 6, 1, 2, 255, 4, 3, 6, 1, 10, 27, 2, 1, 72, 5, 2, 3, 2, 1, 570, 11, 2, 3, 2, 5, 18, 1, 2, 3, 10]

cp's OEIS Frontend

A225766 Least k>0 such that k^4+n is prime, or 0 if k^4+n is always composite.

Table of values

List of values

n	a(n)
0	0
1	1
2	1
3	2
4	1
5	6
6	1
7	2
8	3
9	10
10	1
11	6
12	1
13	2
14	165
15	2
16	1
17	12
18	1
19	20
20	3
21	2
22	1
23	6
24	35
25	2
26	3
27	2
28	1
29	90
30	1
31	2
32	3
33	8
34	5
35	12
36	1
37	2
38	9
39	10
40	1
41	60
42	1
43	2
44	75
45	2
46	1
47	18
48	5
49	20
50	3
51	2
52	1
53	12
54	85
55	2
56	3
57	2
58	1
59	30
60	1
61	4
62	21
63	2
64	0
65	6
66	1
67	2
68	3
69	10
70	1
71	6
72	1
73	2
74	255
75	4
76	3
77	6
78	1
79	10
80	27
81	2
82	1
83	72
84	5
85	2
86	3
87	2
88	1
89	570
90	11
91	2
92	3
93	2
94	5
95	18
96	1
97	2
98	3
99	10

n	a(n)
0	0
1	1
2	1
3	2
4	1
5	6
6	1
7	2
8	3
9	10
10	1
11	6
12	1
13	2
14	165
15	2
16	1
17	12
18	1
19	20
20	3
21	2
22	1
23	6
24	35
25	2
26	3
27	2
28	1
29	90
30	1
31	2
32	3
33	8
34	5
35	12
36	1
37	2
38	9
39	10
40	1
41	60
42	1
43	2
44	75
45	2
46	1
47	18
48	5
49	20
50	3
51	2
52	1
53	12
54	85
55	2
56	3
57	2
58	1
59	30
60	1
61	4
62	21
63	2
64	0
65	6
66	1
67	2
68	3
69	10
70	1
71	6
72	1
73	2
74	255
75	4
76	3
77	6
78	1
79	10
80	27
81	2
82	1
83	72
84	5
85	2
86	3
87	2
88	1
89	570
90	11
91	2
92	3
93	2
94	5
95	18
96	1
97	2
98	3
99	10

n	a(n)
0	0
1	1
2	1
3	2
4	1
5	6
6	1
7	2
8	3
9	10
10	1
11	6
12	1
13	2
14	165
15	2
16	1
17	12
18	1
19	20
20	3
21	2
22	1
23	6
24	35
25	2
26	3
27	2
28	1
29	90
30	1
31	2
32	3
33	8
34	5
35	12
36	1
37	2
38	9
39	10
40	1
41	60
42	1
43	2
44	75
45	2
46	1
47	18
48	5
49	20
50	3
51	2
52	1
53	12
54	85
55	2
56	3
57	2
58	1
59	30
60	1
61	4
62	21
63	2
64	0
65	6
66	1
67	2
68	3
69	10
70	1
71	6
72	1
73	2
74	255
75	4
76	3
77	6
78	1
79	10
80	27
81	2
82	1
83	72
84	5
85	2
86	3
87	2
88	1
89	570
90	11
91	2
92	3
93	2
94	5
95	18
96	1
97	2
98	3
99	10