A117545 - cp's OEIS frontend

A117545 Least k such that Phi(k,n), the k-th cyclotomic polynomial evaluated at n, is prime.

n	a(n)
1	2
2	2
3	1
4	1
5	3
6	1
7	5
8	1
9	6
10	2
11	9
12	1
13	5
14	1
15	3
16	2
17	3
18	1
19	19
20	1
21	3
22	2
23	5
24	1
25	6
26	4
27	3
28	2
29	5
30	1
31	7
32	1
33	3
34	6
35	21
36	2
37	10
38	1
39	6
40	2
41	3
42	1
43	5
44	1
45	19
46	2
47	10
48	1
49	14
50	3
51	6
52	2
53	11
54	1
55	6
56	4
57	3
58	2
59	3
60	1
61	7
62	1
63	5
64	204
65	12
66	2
67	6
68	1
69	3
70	2
71	3
72	1
73	5
74	1
75	3
76	6
77	3
78	2
79	5
80	1
81	6
82	2
83	5
84	1
85	5
86	11
87	7
88	2
89	3
90	1
91	6
92	12
93	7
94	4
95	7
96	2
97	17
98	1
99	3

[2, 2, 1, 1, 3, 1, 5, 1, 6, 2, 9, 1, 5, 1, 3, 2, 3, 1, 19, 1, 3, 2, 5, 1, 6, 4, 3, 2, 5, 1, 7, 1, 3, 6, 21, 2, 10, 1, 6, 2, 3, 1, 5, 1, 19, 2, 10, 1, 14, 3, 6, 2, 11, 1, 6, 4, 3, 2, 3, 1, 7, 1, 5, 204, 12, 2, 6, 1, 3, 2, 3, 1, 5, 1, 3, 6, 3, 2, 5, 1, 6, 2, 5, 1, 5, 11, 7, 2, 3, 1, 6, 12, 7, 4, 7, 2, 17, 1, 3]

cp's OEIS Frontend

A117545 Least k such that Phi(k,n), the k-th cyclotomic polynomial evaluated at n, is prime.

Table of values

List of values

n	a(n)
1	2
2	2
3	1
4	1
5	3
6	1
7	5
8	1
9	6
10	2
11	9
12	1
13	5
14	1
15	3
16	2
17	3
18	1
19	19
20	1
21	3
22	2
23	5
24	1
25	6
26	4
27	3
28	2
29	5
30	1
31	7
32	1
33	3
34	6
35	21
36	2
37	10
38	1
39	6
40	2
41	3
42	1
43	5
44	1
45	19
46	2
47	10
48	1
49	14
50	3
51	6
52	2
53	11
54	1
55	6
56	4
57	3
58	2
59	3
60	1
61	7
62	1
63	5
64	204
65	12
66	2
67	6
68	1
69	3
70	2
71	3
72	1
73	5
74	1
75	3
76	6
77	3
78	2
79	5
80	1
81	6
82	2
83	5
84	1
85	5
86	11
87	7
88	2
89	3
90	1
91	6
92	12
93	7
94	4
95	7
96	2
97	17
98	1
99	3

n	a(n)
1	2
2	2
3	1
4	1
5	3
6	1
7	5
8	1
9	6
10	2
11	9
12	1
13	5
14	1
15	3
16	2
17	3
18	1
19	19
20	1
21	3
22	2
23	5
24	1
25	6
26	4
27	3
28	2
29	5
30	1
31	7
32	1
33	3
34	6
35	21
36	2
37	10
38	1
39	6
40	2
41	3
42	1
43	5
44	1
45	19
46	2
47	10
48	1
49	14
50	3
51	6
52	2
53	11
54	1
55	6
56	4
57	3
58	2
59	3
60	1
61	7
62	1
63	5
64	204
65	12
66	2
67	6
68	1
69	3
70	2
71	3
72	1
73	5
74	1
75	3
76	6
77	3
78	2
79	5
80	1
81	6
82	2
83	5
84	1
85	5
86	11
87	7
88	2
89	3
90	1
91	6
92	12
93	7
94	4
95	7
96	2
97	17
98	1
99	3

n	a(n)
1	2
2	2
3	1
4	1
5	3
6	1
7	5
8	1
9	6
10	2
11	9
12	1
13	5
14	1
15	3
16	2
17	3
18	1
19	19
20	1
21	3
22	2
23	5
24	1
25	6
26	4
27	3
28	2
29	5
30	1
31	7
32	1
33	3
34	6
35	21
36	2
37	10
38	1
39	6
40	2
41	3
42	1
43	5
44	1
45	19
46	2
47	10
48	1
49	14
50	3
51	6
52	2
53	11
54	1
55	6
56	4
57	3
58	2
59	3
60	1
61	7
62	1
63	5
64	204
65	12
66	2
67	6
68	1
69	3
70	2
71	3
72	1
73	5
74	1
75	3
76	6
77	3
78	2
79	5
80	1
81	6
82	2
83	5
84	1
85	5
86	11
87	7
88	2
89	3
90	1
91	6
92	12
93	7
94	4
95	7
96	2
97	17
98	1
99	3