A002238 - cp's OEIS frontend

A002238 Numbers k such that 21*2^k - 1 is prime.

n	a(n)
1	1
2	2
3	3
4	7
5	10
6	13
7	18
8	27
9	37
10	51
11	74
12	157
13	271
14	458
15	530
16	891
17	1723
18	1793
19	1849
20	1986
21	2191
22	2869
23	4993
24	7777
25	11730
26	15313
27	29171
28	35899
29	36227
30	71570
31	199219
32	233914
33	297499
34	332523
35	348547
36	538657
37	986130
38	999599

[1, 2, 3, 7, 10, 13, 18, 27, 37, 51, 74, 157, 271, 458, 530, 891, 1723, 1793, 1849, 1986, 2191, 2869, 4993, 7777, 11730, 15313, 29171, 35899, 36227, 71570, 199219, 233914, 297499, 332523, 348547, 538657, 986130, 999599]

cp's OEIS Frontend

A002238 Numbers k such that 21*2^k - 1 is prime.

Table of values

List of values