A257789 - cp's OEIS frontend

A257789 Numbers n such that 2nprime(n) - 1 and 2nprime(n) + 1 are both prime.

n	a(n)
1	1
2	2
3	3
4	24
5	30
6	33
7	54
8	90
9	156
10	168
11	189
12	225
13	294
14	300
15	402
16	576
17	741
18	780
19	825
20	849
21	918
22	948
23	978
24	1014
25	1245
26	1542
27	1551
28	1608
29	1614
30	1617
31	1770
32	1773
33	1908
34	1914
35	1920
36	1947
37	2025
38	2286
39	2361
40	2370
41	2598
42	2760
43	2865
44	2970
45	3081
46	3516
47	3744
48	3759
49	3948
50	4023

[1, 2, 3, 24, 30, 33, 54, 90, 156, 168, 189, 225, 294, 300, 402, 576, 741, 780, 825, 849, 918, 948, 978, 1014, 1245, 1542, 1551, 1608, 1614, 1617, 1770, 1773, 1908, 1914, 1920, 1947, 2025, 2286, 2361, 2370, 2598, 2760, 2865, 2970, 3081, 3516, 3744, 3759, 3948, 4023]

cp's OEIS Frontend

A257789 Numbers n such that 2nprime(n) - 1 and 2nprime(n) + 1 are both prime.

Table of values

List of values

cp's OEIS Frontend

A257789 Numbers n such that 2n*prime(n) - 1 and 2n*prime(n) + 1 are both prime.

Table of values

List of values

A257789 Numbers n such that 2nprime(n) - 1 and 2nprime(n) + 1 are both prime.