A393208 - OEIS

A393208 as a simple table

n	a(n)
1	7
2	3
3	31
4	5
5	15
6	7
7	127
8	9
9	15
10	11
11	63
12	13
13	31
14	15
15	511
16	17
17	23
18	19
19	63
20	21
21	31
22	23
23	255
24	25
25	31
26	27
27	127
28	29
29	63
30	31
31	2047
32	33
33	39
34	35
35	63
36	37
37	47
38	39
39	255
40	41
41	47
42	43
43	127
44	45
45	63
46	47
47	1023
48	49
49	55
50	51
51	127
52	53
53	63
54	55
55	511
56	57
57	63
58	59
59	255
60	61
61	127
62	63

[7,3,31,5,15,7,127,9,15,11,63,13,31,15,511,17,23, 19,63,21,31,23,255,25,31,27,127,29,63,31,2047,33, 39,35,63,37,47,39,255,41,47,43,127,45,63,47,1023, 49,55,51,127,53,63,55,511,57,63,59,255,61,127,63]