A372113 - cp's OEIS frontend

A372113 Numbers k for which (k-1)/2 and 2*k+1 are both primes.

n	a(n)
1	5
2	11
3	15
4	23
5	35
6	39
7	63
8	75
9	83
10	95
11	119
12	135
13	179
14	215
15	219
16	299
17	303
18	315
19	359
20	363
21	455
22	459
23	483
24	515
25	543
26	615
27	663
28	699
29	719
30	735
31	779
32	803
33	879
34	915
35	923
36	935
37	975
38	999
39	1019
40	1043
41	1143
42	1155
43	1175
44	1199
45	1295
46	1323
47	1355
48	1383
49	1439
50	1539
51	1595
52	1659
53	1679
54	1755
55	1763
56	1815
57	1859
58	1883

[5, 11, 15, 23, 35, 39, 63, 75, 83, 95, 119, 135, 179, 215, 219, 299, 303, 315, 359, 363, 455, 459, 483, 515, 543, 615, 663, 699, 719, 735, 779, 803, 879, 915, 923, 935, 975, 999, 1019, 1043, 1143, 1155, 1175, 1199, 1295, 1323, 1355, 1383, 1439, 1539, 1595, 1659, 1679, 1755, 1763, 1815, 1859, 1883]

cp's OEIS Frontend

A372113 Numbers k for which (k-1)/2 and 2*k+1 are both primes.

Table of values

List of values