A212953 - OEIS

A212953 as a simple table

n	a(n)
1	1
2	3
3	7
4	5
5	31
6	9
7	127
8	17
9	73
10	11
11	23
12	13
13	8191
14	43
15	151
16	257
17	131071
18	19
19	524287
20	25
21	49
22	69
23	47
24	119
25	601
26	2731
27	262657
28	29
29	233
30	77
31	2147483647
32	65537
33	161
34	43691
35	71
36	37
37	223
38	174763
39	79
40	187
41	13367
42	147
43	431
44	115
45	631
46	141
47	2351
48	97
49	4432676798593
50	251

[1,3,7,5,31,9,127,17,73,11,23,13,8191,43,151,257, 131071,19,524287,25,49,69,47,119,601,2731,262657, 29,233,77,2147483647,65537,161,43691,71,37,223, 174763,79,187,13367,147,431,115,631,141,2351,97, 4432676798593,251]