A158019 - cp's OEIS frontend

A158019 Numbers such that (n-1)/2 and 10*n-1 are both prime.

n	a(n)
1	11
2	15
3	23
4	27
5	35
6	39
7	83
8	107
9	123
10	143
11	167
12	179
13	195
14	203
15	207
16	227
17	255
18	275
19	279
20	347
21	399
22	423
23	455
24	479
25	567
26	587
27	623
28	627
29	695
30	707
31	735
32	759
33	767
34	779
35	795
36	839
37	843
38	863
39	867
40	935
41	975
42	983
43	1007
44	1043
45	1095
46	1115
47	1155
48	1215
49	1227
50	1283
51	1323

[11, 15, 23, 27, 35, 39, 83, 107, 123, 143, 167, 179, 195, 203, 207, 227, 255, 275, 279, 347, 399, 423, 455, 479, 567, 587, 623, 627, 695, 707, 735, 759, 767, 779, 795, 839, 843, 863, 867, 935, 975, 983, 1007, 1043, 1095, 1115, 1155, 1215, 1227, 1283, 1323]

cp's OEIS Frontend

A158019 Numbers such that (n-1)/2 and 10*n-1 are both prime.

Table of values

List of values