A250176 - cp's OEIS frontend

A250176 Numbers n such that Phi_20(n) is prime, where Phi is the cyclotomic polynomial.

n	a(n)
1	4
2	9
3	11
4	16
5	19
6	26
7	34
8	45
9	54
10	70
11	86
12	91
13	96
14	101
15	105
16	109
17	110
18	119
19	120
20	126
21	129
22	139
23	141
24	149
25	171
26	181
27	190
28	195
29	215
30	229
31	260
32	276
33	299
34	305
35	309
36	311
37	314
38	319
39	334
40	339
41	369
42	375
43	414
44	420
45	425
46	444
47	470
48	479
49	485
50	506
51	519
52	534
53	540
54	550

[4, 9, 11, 16, 19, 26, 34, 45, 54, 70, 86, 91, 96, 101, 105, 109, 110, 119, 120, 126, 129, 139, 141, 149, 171, 181, 190, 195, 215, 229, 260, 276, 299, 305, 309, 311, 314, 319, 334, 339, 369, 375, 414, 420, 425, 444, 470, 479, 485, 506, 519, 534, 540, 550]

cp's OEIS Frontend

A250176 Numbers n such that Phi_20(n) is prime, where Phi is the cyclotomic polynomial.

Table of values

List of values

n	a(n)
1	4
2	9
3	11
4	16
5	19
6	26
7	34
8	45
9	54
10	70
11	86
12	91
13	96
14	101
15	105
16	109
17	110
18	119
19	120
20	126
21	129
22	139
23	141
24	149
25	171
26	181
27	190
28	195
29	215
30	229
31	260
32	276
33	299
34	305
35	309
36	311
37	314
38	319
39	334
40	339
41	369
42	375
43	414
44	420
45	425
46	444
47	470
48	479
49	485
50	506
51	519
52	534
53	540
54	550

n	a(n)
1	4
2	9
3	11
4	16
5	19
6	26
7	34
8	45
9	54
10	70
11	86
12	91
13	96
14	101
15	105
16	109
17	110
18	119
19	120
20	126
21	129
22	139
23	141
24	149
25	171
26	181
27	190
28	195
29	215
30	229
31	260
32	276
33	299
34	305
35	309
36	311
37	314
38	319
39	334
40	339
41	369
42	375
43	414
44	420
45	425
46	444
47	470
48	479
49	485
50	506
51	519
52	534
53	540
54	550

n	a(n)
1	4
2	9
3	11
4	16
5	19
6	26
7	34
8	45
9	54
10	70
11	86
12	91
13	96
14	101
15	105
16	109
17	110
18	119
19	120
20	126
21	129
22	139
23	141
24	149
25	171
26	181
27	190
28	195
29	215
30	229
31	260
32	276
33	299
34	305
35	309
36	311
37	314
38	319
39	334
40	339
41	369
42	375
43	414
44	420
45	425
46	444
47	470
48	479
49	485
50	506
51	519
52	534
53	540
54	550