A138920 - cp's OEIS frontend

A138920 Indices k such that A020509(k)=Phi[k](-10) is prime, where Phi is a cyclotomic polynomial.

n	a(n)
1	4
2	5
3	7
4	12
5	19
6	24
7	31
8	36
9	38
10	46
11	48
12	53
13	67
14	75
15	78
16	120
17	186
18	196
19	293
20	320
21	327
22	369
23	634
24	641
25	713
26	770
27	931
28	1067
29	1172
30	1194
31	1404
32	1452
33	1752
34	1812
35	1836
36	1844
37	1875
38	1890
39	2062
40	2137
41	2177
42	2232
43	2264
44	3011
45	3042
46	3261
47	3341
48	4775
49	5334
50	6685

[4, 5, 7, 12, 19, 24, 31, 36, 38, 46, 48, 53, 67, 75, 78, 120, 186, 196, 293, 320, 327, 369, 634, 641, 713, 770, 931, 1067, 1172, 1194, 1404, 1452, 1752, 1812, 1836, 1844, 1875, 1890, 2062, 2137, 2177, 2232, 2264, 3011, 3042, 3261, 3341, 4775, 5334, 6685]

cp's OEIS Frontend

A138920 Indices k such that A020509(k)=Phi[k](-10) is prime, where Phi is a cyclotomic polynomial.

Table of values

List of values