A084406 - cp's OEIS frontend

A084406 Numbers k such that k#*2^k-1 is prime, where k# = product of primes <= k.

n	a(n)
1	2
2	3
3	7
4	8
5	14
6	16
7	18
8	20
9	40
10	42
11	44
12	53
13	134
14	154
15	185
16	187
17	191
18	197
19	200
20	201
21	230
22	235
23	239
24	244
25	256
26	282
27	303
28	358
29	489
30	536
31	665
32	684
33	719
34	1098
35	1204
36	1400
37	1516
38	1629
39	1903
40	1997
41	1999
42	2104
43	2477
44	3075
45	3676
46	3785
47	4115
48	5429
49	5808
50	6069
51	6276
52	9095

[2, 3, 7, 8, 14, 16, 18, 20, 40, 42, 44, 53, 134, 154, 185, 187, 191, 197, 200, 201, 230, 235, 239, 244, 256, 282, 303, 358, 489, 536, 665, 684, 719, 1098, 1204, 1400, 1516, 1629, 1903, 1997, 1999, 2104, 2477, 3075, 3676, 3785, 4115, 5429, 5808, 6069, 6276, 9095]

cp's OEIS Frontend

A084406 Numbers k such that k#*2^k-1 is prime, where k# = product of primes <= k.

Table of values

List of values