A239115 - cp's OEIS frontend

A239115 Numbers n such that (n-1)*n^2-1 and n^2-(n-1) are both prime.

n	a(n)
1	2
2	3
3	4
4	6
5	7
6	9
7	13
8	18
9	21
10	22
11	58
12	67
13	79
14	90
15	100
16	106
17	111
18	118
19	120
20	144
21	162
22	174
23	195
24	204
25	246
26	273
27	279
28	345
29	393
30	403
31	406
32	435
33	436
34	526
35	541
36	567
37	613
38	625
39	636
40	702
41	721
42	729
43	736
44	744
45	762
46	763
47	865
48	898
49	961
50	970
51	993
52	1059
53	1099
54	1117
55	1131

[2, 3, 4, 6, 7, 9, 13, 18, 21, 22, 58, 67, 79, 90, 100, 106, 111, 118, 120, 144, 162, 174, 195, 204, 246, 273, 279, 345, 393, 403, 406, 435, 436, 526, 541, 567, 613, 625, 636, 702, 721, 729, 736, 744, 762, 763, 865, 898, 961, 970, 993, 1059, 1099, 1117, 1131]

cp's OEIS Frontend

A239115 Numbers n such that (n-1)*n^2-1 and n^2-(n-1) are both prime.

Table of values

List of values