A223705 - cp's OEIS frontend

A223705 Least number k such that prime(n) is the largest divisor of k^2 + 1, or 0 if there is no such k.

n	a(n)
1	1
2	0
3	2
4	0
5	0
6	5
7	4
8	0
9	0
10	12
11	0
12	6
13	9
14	0
15	0
16	23
17	0
18	11
19	0
20	0
21	27
22	0
23	0
24	34
25	22
26	10
27	0
28	0
29	33
30	15
31	0
32	0
33	37
34	0
35	44
36	0
37	28
38	0
39	0
40	80
41	0
42	19
43	0
44	81
45	14
46	0
47	0
48	0
49	0
50	107
51	89
52	0
53	64
54	0
55	16
56	0
57	82
58	0
59	60
60	53
61	0
62	138
63	0
64	0
65	25
66	114
67	0
68	148
69	0
70	136
71	42
72	0
73	0
74	104
75	0
76	0

[1, 0, 2, 0, 0, 5, 4, 0, 0, 12, 0, 6, 9, 0, 0, 23, 0, 11, 0, 0, 27, 0, 0, 34, 22, 10, 0, 0, 33, 15, 0, 0, 37, 0, 44, 0, 28, 0, 0, 80, 0, 19, 0, 81, 14, 0, 0, 0, 0, 107, 89, 0, 64, 0, 16, 0, 82, 0, 60, 53, 0, 138, 0, 0, 25, 114, 0, 148, 0, 136, 42, 0, 0, 104, 0, 0]

cp's OEIS Frontend

A223705 Least number k such that prime(n) is the largest divisor of k^2 + 1, or 0 if there is no such k.

Table of values

List of values

n	a(n)
1	1
2	0
3	2
4	0
5	0
6	5
7	4
8	0
9	0
10	12
11	0
12	6
13	9
14	0
15	0
16	23
17	0
18	11
19	0
20	0
21	27
22	0
23	0
24	34
25	22
26	10
27	0
28	0
29	33
30	15
31	0
32	0
33	37
34	0
35	44
36	0
37	28
38	0
39	0
40	80
41	0
42	19
43	0
44	81
45	14
46	0
47	0
48	0
49	0
50	107
51	89
52	0
53	64
54	0
55	16
56	0
57	82
58	0
59	60
60	53
61	0
62	138
63	0
64	0
65	25
66	114
67	0
68	148
69	0
70	136
71	42
72	0
73	0
74	104
75	0
76	0

n	a(n)
1	1
2	0
3	2
4	0
5	0
6	5
7	4
8	0
9	0
10	12
11	0
12	6
13	9
14	0
15	0
16	23
17	0
18	11
19	0
20	0
21	27
22	0
23	0
24	34
25	22
26	10
27	0
28	0
29	33
30	15
31	0
32	0
33	37
34	0
35	44
36	0
37	28
38	0
39	0
40	80
41	0
42	19
43	0
44	81
45	14
46	0
47	0
48	0
49	0
50	107
51	89
52	0
53	64
54	0
55	16
56	0
57	82
58	0
59	60
60	53
61	0
62	138
63	0
64	0
65	25
66	114
67	0
68	148
69	0
70	136
71	42
72	0
73	0
74	104
75	0
76	0

n	a(n)
1	1
2	0
3	2
4	0
5	0
6	5
7	4
8	0
9	0
10	12
11	0
12	6
13	9
14	0
15	0
16	23
17	0
18	11
19	0
20	0
21	27
22	0
23	0
24	34
25	22
26	10
27	0
28	0
29	33
30	15
31	0
32	0
33	37
34	0
35	44
36	0
37	28
38	0
39	0
40	80
41	0
42	19
43	0
44	81
45	14
46	0
47	0
48	0
49	0
50	107
51	89
52	0
53	64
54	0
55	16
56	0
57	82
58	0
59	60
60	53
61	0
62	138
63	0
64	0
65	25
66	114
67	0
68	148
69	0
70	136
71	42
72	0
73	0
74	104
75	0
76	0