A138926 - cp's OEIS frontend

A138926 Indices k such that A020503(k)=Phi[k](-4) is prime, where Phi is a cyclotomic polynomial.

n	a(n)
1	3
2	4
3	8
4	12
5	16
6	20
7	28
8	40
9	60
10	92
11	96
12	104
13	140
14	148
15	156
16	300
17	356
18	408
19	596
20	612
21	692
22	732
23	756
24	800
25	952
26	996
27	1004
28	1228
29	1268
30	2240
31	2532
32	3060
33	3796
34	3824
35	3944
36	5096
37	5540
38	7476
39	7700
40	8544
41	9800
42	14628
43	15828
44	16908
45	18480
46	20260
47	21924
48	24656
49	38456

[3, 4, 8, 12, 16, 20, 28, 40, 60, 92, 96, 104, 140, 148, 156, 300, 356, 408, 596, 612, 692, 732, 756, 800, 952, 996, 1004, 1228, 1268, 2240, 2532, 3060, 3796, 3824, 3944, 5096, 5540, 7476, 7700, 8544, 9800, 14628, 15828, 16908, 18480, 20260, 21924, 24656, 38456]

cp's OEIS Frontend

A138926 Indices k such that A020503(k)=Phi[k](-4) is prime, where Phi is a cyclotomic polynomial.

Table of values

List of values