A138927 - cp's OEIS frontend

A138927 Indices k such that A020502(k)=Phi[k](-3) is prime, where Phi is a cyclotomic polynomial.

n	a(n)
1	3
2	5
3	6
4	7
5	12
6	13
7	14
8	18
9	23
10	24
11	26
12	30
13	35
14	36
15	40
16	42
17	43
18	60
19	65
20	66
21	72
22	77
23	108
24	126
25	132
26	142
27	206
28	215
29	236
30	276
31	281
32	286
33	290
34	304
35	322
36	359
37	364
38	391
39	464
40	487
41	510
42	522
43	528
44	529
45	535
46	558
47	574
48	577
49	672
50	680
51	713
52	731
53	760
54	799
55	828
56	892
57	984

[3, 5, 6, 7, 12, 13, 14, 18, 23, 24, 26, 30, 35, 36, 40, 42, 43, 60, 65, 66, 72, 77, 108, 126, 132, 142, 206, 215, 236, 276, 281, 286, 290, 304, 322, 359, 364, 391, 464, 487, 510, 522, 528, 529, 535, 558, 574, 577, 672, 680, 713, 731, 760, 799, 828, 892, 984]

cp's OEIS Frontend

A138927 Indices k such that A020502(k)=Phi[k](-3) is prime, where Phi is a cyclotomic polynomial.

Table of values

List of values

n	a(n)
1	3
2	5
3	6
4	7
5	12
6	13
7	14
8	18
9	23
10	24
11	26
12	30
13	35
14	36
15	40
16	42
17	43
18	60
19	65
20	66
21	72
22	77
23	108
24	126
25	132
26	142
27	206
28	215
29	236
30	276
31	281
32	286
33	290
34	304
35	322
36	359
37	364
38	391
39	464
40	487
41	510
42	522
43	528
44	529
45	535
46	558
47	574
48	577
49	672
50	680
51	713
52	731
53	760
54	799
55	828
56	892
57	984

n	a(n)
1	3
2	5
3	6
4	7
5	12
6	13
7	14
8	18
9	23
10	24
11	26
12	30
13	35
14	36
15	40
16	42
17	43
18	60
19	65
20	66
21	72
22	77
23	108
24	126
25	132
26	142
27	206
28	215
29	236
30	276
31	281
32	286
33	290
34	304
35	322
36	359
37	364
38	391
39	464
40	487
41	510
42	522
43	528
44	529
45	535
46	558
47	574
48	577
49	672
50	680
51	713
52	731
53	760
54	799
55	828
56	892
57	984

n	a(n)
1	3
2	5
3	6
4	7
5	12
6	13
7	14
8	18
9	23
10	24
11	26
12	30
13	35
14	36
15	40
16	42
17	43
18	60
19	65
20	66
21	72
22	77
23	108
24	126
25	132
26	142
27	206
28	215
29	236
30	276
31	281
32	286
33	290
34	304
35	322
36	359
37	364
38	391
39	464
40	487
41	510
42	522
43	528
44	529
45	535
46	558
47	574
48	577
49	672
50	680
51	713
52	731
53	760
54	799
55	828
56	892
57	984