A138933 - cp's OEIS frontend

A138933 Indices k such that A019321(k)=Phi[k](3) is prime, where Phi is a cyclotomic polynomial.

n	a(n)
1	1
2	3
3	6
4	7
5	9
6	10
7	12
8	13
9	14
10	15
11	21
12	24
13	26
14	33
15	36
16	40
17	46
18	60
19	63
20	70
21	71
22	72
23	86
24	103
25	108
26	130
27	132
28	143
29	145
30	154
31	161
32	236
33	255
34	261
35	276
36	279
37	287
38	304
39	364
40	430
41	464
42	513
43	528
44	541
45	562
46	665
47	672
48	680
49	707
50	718
51	747
52	760
53	782
54	828
55	875
56	892
57	974
58	984

[1, 3, 6, 7, 9, 10, 12, 13, 14, 15, 21, 24, 26, 33, 36, 40, 46, 60, 63, 70, 71, 72, 86, 103, 108, 130, 132, 143, 145, 154, 161, 236, 255, 261, 276, 279, 287, 304, 364, 430, 464, 513, 528, 541, 562, 665, 672, 680, 707, 718, 747, 760, 782, 828, 875, 892, 974, 984]

cp's OEIS Frontend

A138933 Indices k such that A019321(k)=Phi[k](3) is prime, where Phi is a cyclotomic polynomial.

Table of values

List of values

n	a(n)
1	1
2	3
3	6
4	7
5	9
6	10
7	12
8	13
9	14
10	15
11	21
12	24
13	26
14	33
15	36
16	40
17	46
18	60
19	63
20	70
21	71
22	72
23	86
24	103
25	108
26	130
27	132
28	143
29	145
30	154
31	161
32	236
33	255
34	261
35	276
36	279
37	287
38	304
39	364
40	430
41	464
42	513
43	528
44	541
45	562
46	665
47	672
48	680
49	707
50	718
51	747
52	760
53	782
54	828
55	875
56	892
57	974
58	984

n	a(n)
1	1
2	3
3	6
4	7
5	9
6	10
7	12
8	13
9	14
10	15
11	21
12	24
13	26
14	33
15	36
16	40
17	46
18	60
19	63
20	70
21	71
22	72
23	86
24	103
25	108
26	130
27	132
28	143
29	145
30	154
31	161
32	236
33	255
34	261
35	276
36	279
37	287
38	304
39	364
40	430
41	464
42	513
43	528
44	541
45	562
46	665
47	672
48	680
49	707
50	718
51	747
52	760
53	782
54	828
55	875
56	892
57	974
58	984

n	a(n)
1	1
2	3
3	6
4	7
5	9
6	10
7	12
8	13
9	14
10	15
11	21
12	24
13	26
14	33
15	36
16	40
17	46
18	60
19	63
20	70
21	71
22	72
23	86
24	103
25	108
26	130
27	132
28	143
29	145
30	154
31	161
32	236
33	255
34	261
35	276
36	279
37	287
38	304
39	364
40	430
41	464
42	513
43	528
44	541
45	562
46	665
47	672
48	680
49	707
50	718
51	747
52	760
53	782
54	828
55	875
56	892
57	974
58	984