A138923 - cp's OEIS frontend

A138923 Indices k such that A020506(k)=Phi[k](-7) is prime, where Phi is a cyclotomic polynomial.

n	a(n)
1	3
2	9
3	10
4	15
5	17
6	23
7	25
8	26
9	27
10	28
11	29
12	36
13	42
14	47
15	48
16	61
17	76
18	84
19	110
20	126
21	148
22	210
23	224
24	262
25	280
26	288
27	296
28	298
29	325
30	327
31	332
32	352
33	365
34	456
35	513
36	528
37	740
38	1062
39	1162
40	1445
41	1460
42	1518
43	1619
44	1660
45	2094
46	2130
47	2260
48	2380
49	3398
50	3447
51	3918

[3, 9, 10, 15, 17, 23, 25, 26, 27, 28, 29, 36, 42, 47, 48, 61, 76, 84, 110, 126, 148, 210, 224, 262, 280, 288, 296, 298, 325, 327, 332, 352, 365, 456, 513, 528, 740, 1062, 1162, 1445, 1460, 1518, 1619, 1660, 2094, 2130, 2260, 2380, 3398, 3447, 3918]

cp's OEIS Frontend

A138923 Indices k such that A020506(k)=Phi[k](-7) is prime, where Phi is a cyclotomic polynomial.

Table of values

List of values