A057821 - cp's OEIS frontend

A057821 a(n) is the least nonnegative integer k such that 2^n - k is a safe prime.

n	a(n)
3	1
4	5
5	9
6	5
7	21
8	29
9	9
10	5
11	9
12	17
13	45
14	161
15	165
16	269
17	285
18	17
19	45
20	233
21	9
22	17
23	321
24	317
25	633
26	677
27	405
28	437
29	189
30	1385
31	69
32	209
33	9
34	641
35	849
36	137
37	45
38	401
39	381
40	437
41	1965
42	2201
43	741
44	1493
45	573
46	857
47	1485
48	5297
49	2709
50	161
51	465
52	473
53	1269
54	4805
55	789

[1, 5, 9, 5, 21, 29, 9, 5, 9, 17, 45, 161, 165, 269, 285, 17, 45, 233, 9, 17, 321, 317, 633, 677, 405, 437, 189, 1385, 69, 209, 9, 641, 849, 137, 45, 401, 381, 437, 1965, 2201, 741, 1493, 573, 857, 1485, 5297, 2709, 161, 465, 473, 1269, 4805, 789]

cp's OEIS Frontend

A057821 a(n) is the least nonnegative integer k such that 2^n - k is a safe prime.

Table of values

List of values