A175727 - cp's OEIS frontend

A175727 Numbers k such that both A000203(k)-k-1 and A000203(k)-2*k-1 are prime numbers.

n	a(n)
1	30
2	42
3	60
4	70
5	78
6	102
7	138
8	186
9	198
10	216
11	222
12	228
13	240
14	246
15	258
16	270
17	282
18	360
19	372
20	390
21	414
22	438
23	492
24	498
25	546
26	582
27	600
28	606
29	642
30	708
31	720
32	756
33	762
34	774
35	786
36	810
37	852
38	870
39	930
40	942
41	954
42	1002
43	1014
44	1020
45	1026
46	1038
47	1068
48	1086
49	1182
50	1266
51	1290

[30, 42, 60, 70, 78, 102, 138, 186, 198, 216, 222, 228, 240, 246, 258, 270, 282, 360, 372, 390, 414, 438, 492, 498, 546, 582, 600, 606, 642, 708, 720, 756, 762, 774, 786, 810, 852, 870, 930, 942, 954, 1002, 1014, 1020, 1026, 1038, 1068, 1086, 1182, 1266, 1290]

cp's OEIS Frontend

A175727 Numbers k such that both A000203(k)-k-1 and A000203(k)-2*k-1 are prime numbers.

Table of values

List of values