A124493 - cp's OEIS frontend

A124493 Numbers k for which 2k-1, 4k-1 and 8*k-1 are primes.

n	a(n)
1	3
2	6
3	21
4	45
5	90
6	180
7	255
8	360
9	510
10	516
11	615
12	705
13	726
14	741
15	756
16	906
17	945
18	951
19	966
20	1230
21	1350
22	1410
23	1725
24	1746
25	1770
26	1911
27	1956
28	2541
29	2700
30	2721
31	2925
32	3051
33	3066
34	3225
35	3540
36	3576
37	3675
38	3951
39	4485
40	4611
41	5295
42	5346
43	5355
44	5586
45	5736
46	5775
47	5901

[3, 6, 21, 45, 90, 180, 255, 360, 510, 516, 615, 705, 726, 741, 756, 906, 945, 951, 966, 1230, 1350, 1410, 1725, 1746, 1770, 1911, 1956, 2541, 2700, 2721, 2925, 3051, 3066, 3225, 3540, 3576, 3675, 3951, 4485, 4611, 5295, 5346, 5355, 5586, 5736, 5775, 5901]

cp's OEIS Frontend

A124493 Numbers k for which 2k-1, 4k-1 and 8*k-1 are primes.

Table of values

List of values

cp's OEIS Frontend

A124493 Numbers k for which 2*k-1, 4*k-1 and 8*k-1 are primes.

Table of values

List of values

A124493 Numbers k for which 2k-1, 4k-1 and 8*k-1 are primes.