A252503 - cp's OEIS frontend

A252503 Smallest prime p such that Phi_n(p) is also prime, where Phi is the cyclotomic polynomial, or 0 if no such p exists.

n	a(n)
1	3
2	2
3	2
4	2
5	2
6	2
7	2
8	2
9	2
10	2
11	5
12	2
13	2
14	2
15	2
16	2
17	2
18	7
19	2
20	11
21	3
22	2
23	113
24	2
25	43
26	2
27	2
28	5
29	151
30	2
31	2
32	2
33	2
34	2
35	179
36	3
37	61
38	2
39	23
40	2
41	53
42	2
43	89
44	137
45	11
46	2
47	5
48	5
49	2
50	7
51	73
52	11
53	307
54	7
55	7
56	2
57	5
58	7
59	19
60	3
61	2
62	2
63	3
64	0
65	2
66	53
67	491
68	197
69	2
70	3
71	3
72	3
73	11
74	19
75	59
76	7
77	2
78	2
79	271
80	2
81	191
82	61
83	41
84	7
85	2
86	2
87	59
88	5
89	2
90	2

[3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 5, 2, 2, 2, 2, 2, 2, 7, 2, 11, 3, 2, 113, 2, 43, 2, 2, 5, 151, 2, 2, 2, 2, 2, 179, 3, 61, 2, 23, 2, 53, 2, 89, 137, 11, 2, 5, 5, 2, 7, 73, 11, 307, 7, 7, 2, 5, 7, 19, 3, 2, 2, 3, 0, 2, 53, 491, 197, 2, 3, 3, 3, 11, 19, 59, 7, 2, 2, 271, 2, 191, 61, 41, 7, 2, 2, 59, 5, 2, 2]

cp's OEIS Frontend

A252503 Smallest prime p such that Phi_n(p) is also prime, where Phi is the cyclotomic polynomial, or 0 if no such p exists.

Table of values

List of values

n	a(n)
1	3
2	2
3	2
4	2
5	2
6	2
7	2
8	2
9	2
10	2
11	5
12	2
13	2
14	2
15	2
16	2
17	2
18	7
19	2
20	11
21	3
22	2
23	113
24	2
25	43
26	2
27	2
28	5
29	151
30	2
31	2
32	2
33	2
34	2
35	179
36	3
37	61
38	2
39	23
40	2
41	53
42	2
43	89
44	137
45	11
46	2
47	5
48	5
49	2
50	7
51	73
52	11
53	307
54	7
55	7
56	2
57	5
58	7
59	19
60	3
61	2
62	2
63	3
64	0
65	2
66	53
67	491
68	197
69	2
70	3
71	3
72	3
73	11
74	19
75	59
76	7
77	2
78	2
79	271
80	2
81	191
82	61
83	41
84	7
85	2
86	2
87	59
88	5
89	2
90	2

n	a(n)
1	3
2	2
3	2
4	2
5	2
6	2
7	2
8	2
9	2
10	2
11	5
12	2
13	2
14	2
15	2
16	2
17	2
18	7
19	2
20	11
21	3
22	2
23	113
24	2
25	43
26	2
27	2
28	5
29	151
30	2
31	2
32	2
33	2
34	2
35	179
36	3
37	61
38	2
39	23
40	2
41	53
42	2
43	89
44	137
45	11
46	2
47	5
48	5
49	2
50	7
51	73
52	11
53	307
54	7
55	7
56	2
57	5
58	7
59	19
60	3
61	2
62	2
63	3
64	0
65	2
66	53
67	491
68	197
69	2
70	3
71	3
72	3
73	11
74	19
75	59
76	7
77	2
78	2
79	271
80	2
81	191
82	61
83	41
84	7
85	2
86	2
87	59
88	5
89	2
90	2

n	a(n)
1	3
2	2
3	2
4	2
5	2
6	2
7	2
8	2
9	2
10	2
11	5
12	2
13	2
14	2
15	2
16	2
17	2
18	7
19	2
20	11
21	3
22	2
23	113
24	2
25	43
26	2
27	2
28	5
29	151
30	2
31	2
32	2
33	2
34	2
35	179
36	3
37	61
38	2
39	23
40	2
41	53
42	2
43	89
44	137
45	11
46	2
47	5
48	5
49	2
50	7
51	73
52	11
53	307
54	7
55	7
56	2
57	5
58	7
59	19
60	3
61	2
62	2
63	3
64	0
65	2
66	53
67	491
68	197
69	2
70	3
71	3
72	3
73	11
74	19
75	59
76	7
77	2
78	2
79	271
80	2
81	191
82	61
83	41
84	7
85	2
86	2
87	59
88	5
89	2
90	2