A138922 - cp's OEIS frontend

A138922 Indices k such that A020507(k)=Phi[k](-8) is prime, where Phi is a cyclotomic polynomial.

n	a(n)
1	6
2	15
3	18
4	21
5	39
6	69
7	159
8	165
9	174
10	231
11	378
12	408
13	501
14	504
15	606
16	873
17	897
18	1122
19	1209
20	1395
21	1947
22	2040
23	2361
24	2778
25	3369
26	7305
27	7647
28	8154
29	8331
30	9483
31	13071
32	14616
33	15819
34	20301
35	21282
36	27144
37	31083
38	34725
39	35775
40	36855
41	38118
42	39360

[6, 15, 18, 21, 39, 69, 159, 165, 174, 231, 378, 408, 501, 504, 606, 873, 897, 1122, 1209, 1395, 1947, 2040, 2361, 2778, 3369, 7305, 7647, 8154, 8331, 9483, 13071, 14616, 15819, 20301, 21282, 27144, 31083, 34725, 35775, 36855, 38118, 39360]

cp's OEIS Frontend

A138922 Indices k such that A020507(k)=Phi[k](-8) is prime, where Phi is a cyclotomic polynomial.

Table of values

List of values